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1: <HTML> 2: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 3:  4:  13: <HEAD> 14: <TITLE>GNU History Library: </TITLE> 15: 16: <META NAME="description" CONTENT="GNU History Library: "> 17: <META NAME="keywords" CONTENT="GNU History Library: "> 18: <META NAME="resource-type" CONTENT="document"> 19: <META NAME="distribution" CONTENT="global"> 20: <META NAME="Generator" CONTENT="texi2html 1.64"> 21: 22: </HEAD> 23: 24: <BODY LANG="" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#800080" ALINK="#FF0000"> 25: 26: <A NAME="SEC_Top"></A> 27: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 28: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 29: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 30: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 31: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 32: </TR></TABLE> 33: <H1>GNU History Library</H1> 34: 35: This document describes the GNU History library, a programming tool that 36: provides a consistent user interface for recalling lines of previously 37: typed input. 38:  39: 40: <BLOCKQUOTE><TABLE BORDER=0 CELLSPACING=0> 41: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC1">1. Using History Interactively</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">GNU History User's Manual.</TD></TR> 42: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC6">2. Programming with GNU History</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">GNU History Programmer's Manual.</TD></TR> 43: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC19">A. GNU Free Documentation License</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">License for copying this manual.</TD></TR> 44: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC21">B. Concept Index</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Index of concepts described in this manual.</TD></TR> 45: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC22">C. Function and Variable Index</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Index of externally visible functions 46: and variables.</TD></TR> 47: </TABLE></BLOCKQUOTE> 48:  49: 50: <HR SIZE=1> 51: <A NAME="SEC1"></A> 52: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 53: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top"> < </A>]</TD> 54: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC2"> > </A>]</TD> 55: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[ << ]</TD> 56: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top"> Up </A>]</TD> 57: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC6"> >> </A>]</TD> 58: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 59: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 60: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 61: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 62: </TR></TABLE> 63: <A NAME="Using History Interactively"></A> 64: <H1> 1. Using History Interactively </H1> 65:  66:  67: 68: This chapter describes how to use the GNU History Library interactively, 69: from a user's standpoint. It should be considered a user's guide. For 70: information on using the GNU History Library in your own programs, 71: see section <A HREF="history.html#SEC6">2. Programming with GNU History</A>. 72:  73: 74: <BLOCKQUOTE><TABLE BORDER=0 CELLSPACING=0> 75: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC2">1.1 History Expansion</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">What it feels like using History as a user.</TD></TR> 76: </TABLE></BLOCKQUOTE> 77:  78: 79: <A NAME="History Interaction"></A> 80: <HR SIZE="6"> 81: <A NAME="SEC2"></A> 82: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 83: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC1"> < </A>]</TD> 84: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC3"> > </A>]</TD> 85: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[ << ]</TD> 86: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC1"> Up </A>]</TD> 87: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC6"> >> </A>]</TD> 88: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 89: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 90: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 91: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 92: </TR></TABLE> 93: <H2> 1.1 History Expansion </H2> 94:  95:  96: 97: The History library provides a history expansion feature that is similar 98: to the history expansion provided by <CODE>csh</CODE>. This section 99: describes the syntax used to manipulate the history information. 100:  101: 102: History expansions introduce words from the history list into 103: the input stream, making it easy to repeat commands, insert the 104: arguments to a previous command into the current input line, or 105: fix errors in previous commands quickly. 106:  107: 108: History expansion takes place in two parts. The first is to determine 109: which line from the history list should be used during substitution. 110: The second is to select portions of that line for inclusion into the 111: current one. The line selected from the history is called the 112: event, and the portions of that line that are acted upon are 113: called words. Various modifiers are available to manipulate 114: the selected words. The line is broken into words in the same fashion 115: that Bash does, so that several words 116: surrounded by quotes are considered one word. 117: History expansions are introduced by the appearance of the 118: history expansion character, which is <SAMP>`!'</SAMP> by default. 119:  120: 121: History expansion implements shell-like quoting conventions: 122: a backslash can be used to remove the special handling for the next character; 123: single quotes enclose verbatim sequences of characters, and can be used to 124: inhibit history expansion; 125: and characters enclosed within double quotes may be subject to history 126: expansion, since backslash can escape the history expansion character, 127: but single quotes may not, since they are not treated specially within 128: double quotes. 129:  130: 131: <BLOCKQUOTE><TABLE BORDER=0 CELLSPACING=0> 132: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC3">1.1.1 Event Designators</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">How to specify which history line to use.</TD></TR> 133: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC4">1.1.2 Word Designators</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Specifying which words are of interest.</TD></TR> 134: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC5">1.1.3 Modifiers</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Modifying the results of substitution.</TD></TR> 135: </TABLE></BLOCKQUOTE> 136:  137: 138: <A NAME="Event Designators"></A> 139: <HR SIZE="6"> 140: <A NAME="SEC3"></A> 141: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 142: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC2"> < </A>]</TD> 143: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC4"> > </A>]</TD> 144: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[ << ]</TD> 145: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC2"> Up </A>]</TD> 146: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC6"> >> </A>]</TD> 147: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 148: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 149: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 150: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 151: </TR></TABLE> 152: <H3> 1.1.1 Event Designators </H3> 153:  154:  155: 156: An event designator is a reference to a command line entry in the 157: history list. 158: Unless the reference is absolute, events are relative to the current 159: position in the history list. 160: <A NAME="IDX1"></A> 161:  162: 163: <DL COMPACT> 164: 165: <DT><CODE>!</CODE> 166: <DD>Start a history substitution, except when followed by a space, tab, 167: the end of the line, or <SAMP>`='</SAMP>. 168:  169: 170: <DT><CODE>!<VAR>n</VAR></CODE> 171: <DD>Refer to command line <VAR>n</VAR>. 172:  173: 174: <DT><CODE>!-<VAR>n</VAR></CODE> 175: <DD>Refer to the command <VAR>n</VAR> lines back. 176:  177: 178: <DT><CODE>!!</CODE> 179: <DD>Refer to the previous command. This is a synonym for <SAMP>`!-1'</SAMP>. 180:  181: 182: <DT><CODE>!<VAR>string</VAR></CODE> 183: <DD>Refer to the most recent command 184: preceding the current position in the history list 185: starting with <VAR>string</VAR>. 186:  187: 188: <DT><CODE>!?<VAR>string</VAR>[?]</CODE> 189: <DD>Refer to the most recent command 190: preceding the current position in the history list 191: containing <VAR>string</VAR>. 192: The trailing 193: <SAMP>`?'</SAMP> may be omitted if the <VAR>string</VAR> is followed immediately by 194: a newline. 195: If <VAR>string</VAR> is missing, the string from the most recent search is used; 196: it is an error if there is no previous search string. 197:  198: 199: <DT><CODE>^<VAR>string1</VAR>^<VAR>string2</VAR>^</CODE> 200: <DD>Quick Substitution. Repeat the last command, replacing <VAR>string1</VAR> 201: with <VAR>string2</VAR>. Equivalent to 202: <CODE>!!:s^<VAR>string1</VAR>^<VAR>string2</VAR>^</CODE>. 203:  204: 205: <DT><CODE>!#</CODE> 206: <DD>The entire command line typed so far. 207:  208: 209: </DL> 210:  211: 212: <A NAME="Word Designators"></A> 213: <HR SIZE="6"> 214: <A NAME="SEC4"></A> 215: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 216: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC3"> < </A>]</TD> 217: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC5"> > </A>]</TD> 218: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC5"> << </A>]</TD> 219: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC2"> Up </A>]</TD> 220: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC6"> >> </A>]</TD> 221: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 222: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 223: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 224: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 225: </TR></TABLE> 226: <H3> 1.1.2 Word Designators </H3> 227:  228:  229: 230: Word designators are used to select desired words from the event. 231: A <SAMP>`:'</SAMP> separates the event specification from the word designator. It 232: may be omitted if the word designator begins with a <SAMP>`^'</SAMP>, <SAMP>`$'</SAMP>, 233: <SAMP>`*'</SAMP>, <SAMP>`-'</SAMP>, or <SAMP>`%'</SAMP>. Words are numbered from the beginning 234: of the line, with the first word being denoted by 0 (zero). Words are 235: inserted into the current line separated by single spaces. 236:  237: 238: For example, 239:  240: 241: <DL COMPACT> 242: <DT><CODE>!!</CODE> 243: <DD>designates the preceding command. When you type this, the preceding 244: command is repeated in toto. 245:  246: 247: <DT><CODE>!!:$</CODE> 248: <DD>designates the last argument of the preceding command. This may be 249: shortened to <CODE>!$</CODE>. 250:  251: 252: <DT><CODE>!fi:2</CODE> 253: <DD>designates the second argument of the most recent command starting with 254: the letters <CODE>fi</CODE>. 255: </DL> 256:  257: 258: Here are the word designators: 259: 260: <DL COMPACT> 261: 262: <DT><CODE>0 (zero)</CODE> 263: <DD>The <CODE>0</CODE>th word. For many applications, this is the command word. 264:  265: 266: <DT><CODE><VAR>n</VAR></CODE> 267: <DD>The <VAR>n</VAR>th word. 268:  269: 270: <DT><CODE>^</CODE> 271: <DD>The first argument; that is, word 1. 272:  273: 274: <DT><CODE>$</CODE> 275: <DD>The last argument. 276:  277: 278: <DT><CODE>%</CODE> 279: <DD>The first word matched by the most recent <SAMP>`?<VAR>string</VAR>?'</SAMP> search, 280: if the search string begins with a character that is part of a word. 281:  282: 283: <DT><CODE><VAR>x</VAR>-<VAR>y</VAR></CODE> 284: <DD>A range of words; <SAMP>`-<VAR>y</VAR>'</SAMP> abbreviates <SAMP>`0-<VAR>y</VAR>'</SAMP>. 285:  286: 287: <DT><CODE>*</CODE> 288: <DD>All of the words, except the <CODE>0</CODE>th. This is a synonym for <SAMP>`1-$'</SAMP>. 289: It is not an error to use <SAMP>`*'</SAMP> if there is just one word in the event; 290: the empty string is returned in that case. 291:  292: 293: <DT><CODE><VAR>x</VAR>*</CODE> 294: <DD>Abbreviates <SAMP>`<VAR>x</VAR>-$'</SAMP> 295:  296: 297: <DT><CODE><VAR>x</VAR>-</CODE> 298: <DD>Abbreviates <SAMP>`<VAR>x</VAR>-$'</SAMP> like <SAMP>`<VAR>x</VAR>*'</SAMP>, but omits the last word. 299: If <SAMP>`x'</SAMP> is missing, it defaults to 0. 300:  301: 302: </DL> 303:  304: 305: If a word designator is supplied without an event specification, the 306: previous command is used as the event. 307:  308: 309: <A NAME="Modifiers"></A> 310: <HR SIZE="6"> 311: <A NAME="SEC5"></A> 312: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 313: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC4"> < </A>]</TD> 314: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC6"> > </A>]</TD> 315: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[ << ]</TD> 316: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC2"> Up </A>]</TD> 317: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC6"> >> </A>]</TD> 318: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 319: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 320: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 321: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 322: </TR></TABLE> 323: <H3> 1.1.3 Modifiers </H3> 324:  325:  326: 327: After the optional word designator, you can add a sequence of one or more 328: of the following modifiers, each preceded by a <SAMP>`:'</SAMP>. 329: These modify, or edit, the word or words selected from the history event. 330:  331: 332: <DL COMPACT> 333: 334: <DT><CODE>h</CODE> 335: <DD>Remove a trailing pathname component, leaving only the head. 336:  337: 338: <DT><CODE>t</CODE> 339: <DD>Remove all leading pathname components, leaving the tail. 340:  341: 342: <DT><CODE>r</CODE> 343: <DD>Remove a trailing suffix of the form <SAMP>`.<VAR>suffix</VAR>'</SAMP>, leaving 344: the basename. 345:  346: 347: <DT><CODE>e</CODE> 348: <DD>Remove all but the trailing suffix. 349:  350: 351: <DT><CODE>p</CODE> 352: <DD>Print the new command but do not execute it. 353:  354: 355: <DT><CODE>s/<VAR>old</VAR>/<VAR>new</VAR>/</CODE> 356: <DD>Substitute <VAR>new</VAR> for the first occurrence of <VAR>old</VAR> in the 357: event line. 358: Any character may be used as the delimiter in place of <SAMP>`/'</SAMP>. 359: The delimiter may be quoted in <VAR>old</VAR> and <VAR>new</VAR> 360: with a single backslash. If <SAMP>`&'</SAMP> appears in <VAR>new</VAR>, 361: it is replaced by <VAR>old</VAR>. A single backslash will quote 362: the <SAMP>`&'</SAMP>. 363: If <VAR>old</VAR> is null, it is set to the last <VAR>old</VAR> 364: substituted, or, if no previous history substitutions took place, 365: the last <VAR>string</VAR> 366: in a !?<VAR>string</VAR><CODE>[?]</CODE> 367: search. 368: If <VAR>new</VAR> is is null, each matching <VAR>old</VAR> is deleted. 369: The final delimiter is optional if it is the last 370: character on the input line. 371:  372: 373: <DT><CODE>&</CODE> 374: <DD>Repeat the previous substitution. 375:  376: 377: <DT><CODE>g</CODE> 378: <DD><DT><CODE>a</CODE> 379: <DD>Cause changes to be applied over the entire event line. Used in 380: conjunction with <SAMP>`s'</SAMP>, as in <CODE>gs/<VAR>old</VAR>/<VAR>new</VAR>/</CODE>, 381: or with <SAMP>`&'</SAMP>. 382:  383: 384: <DT><CODE>G</CODE> 385: <DD>Apply the following <SAMP>`s'</SAMP> or <SAMP>`&'</SAMP> modifier once to each word 386: in the event. 387:  388: 389: </DL> 390:  391: 392: <A NAME="Programming with GNU History"></A> 393: <HR SIZE="6"> 394: <A NAME="SEC6"></A> 395: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 396: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC5"> < </A>]</TD> 397: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC7"> > </A>]</TD> 398: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[ << ]</TD> 399: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top"> Up </A>]</TD> 400: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC19"> >> </A>]</TD> 401: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 402: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 403: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 404: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 405: </TR></TABLE> 406: <H1> 2. Programming with GNU History </H1> 407:  408:  409: 410: This chapter describes how to interface programs that you write 411: with the GNU History Library. 412: It should be considered a technical guide. 413: For information on the interactive use of GNU History, see section <A HREF="history.html#SEC1">1. Using History Interactively</A>. 414:  415: 416: <BLOCKQUOTE><TABLE BORDER=0 CELLSPACING=0> 417: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC7">2.1 Introduction to History</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">What is the GNU History library for?</TD></TR> 418: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC8">2.2 History Storage</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">How information is stored.</TD></TR> 419: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC9">2.3 History Functions</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Functions that you can use.</TD></TR> 420: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC17">2.4 History Variables</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Variables that control behaviour.</TD></TR> 421: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC18">2.5 History Programming Example</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Example of using the GNU History Library.</TD></TR> 422: </TABLE></BLOCKQUOTE> 423:  424: 425: <A NAME="Introduction to History"></A> 426: <HR SIZE="6"> 427: <A NAME="SEC7"></A> 428: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 429: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC6"> < </A>]</TD> 430: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC8"> > </A>]</TD> 431: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[ << ]</TD> 432: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC6"> Up </A>]</TD> 433: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC19"> >> </A>]</TD> 434: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 435: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 436: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 437: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 438: </TR></TABLE> 439: <H2> 2.1 Introduction to History </H2> 440:  441:  442: 443: Many programs read input from the user a line at a time. The GNU 444: History library is able to keep track of those lines, associate arbitrary 445: data with each line, and utilize information from previous lines in 446: composing new ones. 447:  448: 449: A programmer using the History library has available functions 450: for remembering lines on a history list, associating arbitrary data 451: with a line, removing lines from the list, searching through the list 452: for a line containing an arbitrary text string, and referencing any line 453: in the list directly. In addition, a history expansion function 454: is available which provides for a consistent user interface across 455: different programs. 456:  457: 458: The user using programs written with the History library has the 459: benefit of a consistent user interface with a set of well-known 460: commands for manipulating the text of previous lines and using that text 461: in new commands. The basic history manipulation commands are similar to 462: the history substitution provided by <CODE>csh</CODE>. 463:  464: 465: The programmer can also use the Readline library, which 466: includes some history manipulation by default, and has the added 467: advantage of command line editing. 468:  469: 470: Before declaring any functions using any functionality the History 471: library provides in other code, an application writer should include 472: the file <CODE><readline/history.h></CODE> in any file that uses the 473: History library's features. It supplies extern declarations for all 474: of the library's public functions and variables, and declares all of 475: the public data structures. 476:  477: 478: <A NAME="History Storage"></A> 479: <HR SIZE="6"> 480: <A NAME="SEC8"></A> 481: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 482: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC7"> < </A>]</TD> 483: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC9"> > </A>]</TD> 484: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC9"> << </A>]</TD> 485: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC6"> Up </A>]</TD> 486: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC19"> >> </A>]</TD> 487: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 488: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 489: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 490: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 491: </TR></TABLE> 492: <H2> 2.2 History Storage </H2> 493:  494:  495: 496: The history list is an array of history entries. A history entry is 497: declared as follows: 498:  499: 500: <TABLE><tr><td> </td><td class=example><pre>typedef void *histdata_t; 501: 502: typedef struct _hist_entry { 503: char *line; 504: char *timestamp; 505: histdata_t data; 506: } HIST_ENTRY; 507: </pre></td></tr></table> 508: 509: The history list itself might therefore be declared as 510:  511: 512: <TABLE><tr><td> </td><td class=example><pre>HIST_ENTRY **the_history_list; 513: </pre></td></tr></table> 514: 515: The state of the History library is encapsulated into a single structure: 516:  517: 518: <TABLE><tr><td> </td><td class=example><pre>/* 519: * A structure used to pass around the current state of the history. 520: */ 521: typedef struct _hist_state { 522: HIST_ENTRY **entries; /* Pointer to the entries themselves. */ 523: int offset; /* The location pointer within this array. */ 524: int length; /* Number of elements within this array. */ 525: int size; /* Number of slots allocated to this array. */ 526: int flags; 527: } HISTORY_STATE; 528: </pre></td></tr></table> 529: 530: If the flags member includes <CODE>HS_STIFLED</CODE>, the history has been 531: stifled. 532:  533: 534: <A NAME="History Functions"></A> 535: <HR SIZE="6"> 536: <A NAME="SEC9"></A> 537: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 538: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC8"> < </A>]</TD> 539: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC10"> > </A>]</TD> 540: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC17"> << </A>]</TD> 541: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC6"> Up </A>]</TD> 542: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC17"> >> </A>]</TD> 543: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 544: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 545: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 546: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 547: </TR></TABLE> 548: <H2> 2.3 History Functions </H2> 549:  550:  551: 552: This section describes the calling sequence for the various functions 553: exported by the GNU History library. 554:  555: 556: <BLOCKQUOTE><TABLE BORDER=0 CELLSPACING=0> 557: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC10">2.3.1 Initializing History and State Management</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Functions to call when you 558: want to use history in a 559: program.</TD></TR> 560: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC11">2.3.2 History List Management</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Functions used to manage the list 561: of history entries.</TD></TR> 562: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC12">2.3.3 Information About the History List</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Functions returning information about 563: the history list.</TD></TR> 564: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC13">2.3.4 Moving Around the History List</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Functions used to change the position 565: in the history list.</TD></TR> 566: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC14">2.3.5 Searching the History List</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Functions to search the history list 567: for entries containing a string.</TD></TR> 568: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC15">2.3.6 Managing the History File</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Functions that read and write a file 569: containing the history list.</TD></TR> 570: <TR><TD ALIGN="left" VALIGN="TOP"><A HREF="history.html#SEC16">2.3.7 History Expansion</A></TD><TD>  </TD><TD ALIGN="left" VALIGN="TOP">Functions to perform csh-like history 571: expansion.</TD></TR> 572: </TABLE></BLOCKQUOTE> 573:  574: 575: <A NAME="Initializing History and State Management"></A> 576: <HR SIZE="6"> 577: <A NAME="SEC10"></A> 578: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 579: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC9"> < </A>]</TD> 580: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC11"> > </A>]</TD> 581: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC17"> << </A>]</TD> 582: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC9"> Up </A>]</TD> 583: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC17"> >> </A>]</TD> 584: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 585: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 586: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 587: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 588: </TR></TABLE> 589: <H3> 2.3.1 Initializing History and State Management </H3> 590:  591:  592: 593: This section describes functions used to initialize and manage 594: the state of the History library when you want to use the history 595: functions in your program. 596:  597: 598: <A NAME="IDX2"></A> 599: <DL> 600: <DT>Function: void using_history (void) 601: <DD>Begin a session in which the history functions might be used. This 602: initializes the interactive variables. 603: </DL> 604:  605: 606: <A NAME="IDX3"></A> 607: <DL> 608: <DT>Function: HISTORY_STATE * history_get_history_state (void) 609: <DD>Return a structure describing the current state of the input history. 610: </DL> 611:  612: 613: <A NAME="IDX4"></A> 614: <DL> 615: <DT>Function: void history_set_history_state (HISTORY_STATE *state) 616: <DD>Set the state of the history list according to <VAR>state</VAR>. 617: </DL> 618:  619: 620: <A NAME="History List Management"></A> 621: <HR SIZE="6"> 622: <A NAME="SEC11"></A> 623: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 624: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC10"> < </A>]</TD> 625: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC12"> > </A>]</TD> 626: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC12"> << </A>]</TD> 627: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC9"> Up </A>]</TD> 628: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC17"> >> </A>]</TD> 629: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 630: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 631: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 632: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 633: </TR></TABLE> 634: <H3> 2.3.2 History List Management </H3> 635:  636:  637: 638: These functions manage individual entries on the history list, or set 639: parameters managing the list itself. 640:  641: 642: <A NAME="IDX5"></A> 643: <DL> 644: <DT>Function: void add_history (const char *string) 645: <DD>Place <VAR>string</VAR> at the end of the history list. The associated data 646: field (if any) is set to <CODE>NULL</CODE>. 647: If the maximum number of history entries has been set using 648: <CODE>stifle_history()</CODE>, and the new number of history entries would exceed 649: that maximum, the oldest history entry is removed. 650: </DL> 651:  652: 653: <A NAME="IDX6"></A> 654: <DL> 655: <DT>Function: void add_history_time (const char *string) 656: <DD>Change the time stamp associated with the most recent history entry to 657: <VAR>string</VAR>. 658: </DL> 659:  660: 661: <A NAME="IDX7"></A> 662: <DL> 663: <DT>Function: HIST_ENTRY * remove_history (int which) 664: <DD>Remove history entry at offset <VAR>which</VAR> from the history. The 665: removed element is returned so you can free the line, data, 666: and containing structure. 667: </DL> 668:  669: 670: <A NAME="IDX8"></A> 671: <DL> 672: <DT>Function: histdata_t free_history_entry (HIST_ENTRY *histent) 673: <DD>Free the history entry <VAR>histent</VAR> and any history library private 674: data associated with it. Returns the application-specific data 675: so the caller can dispose of it. 676: </DL> 677:  678: 679: <A NAME="IDX9"></A> 680: <DL> 681: <DT>Function: HIST_ENTRY * replace_history_entry (int which, const char *line, histdata_t data) 682: <DD>Make the history entry at offset <VAR>which</VAR> have <VAR>line</VAR> and <VAR>data</VAR>. 683: This returns the old entry so the caller can dispose of any 684: application-specific data. In the case 685: of an invalid <VAR>which</VAR>, a <CODE>NULL</CODE> pointer is returned. 686: </DL> 687:  688: 689: <A NAME="IDX10"></A> 690: <DL> 691: <DT>Function: void clear_history (void) 692: <DD>Clear the history list by deleting all the entries. 693: </DL> 694:  695: 696: <A NAME="IDX11"></A> 697: <DL> 698: <DT>Function: void stifle_history (int max) 699: <DD>Stifle the history list, remembering only the last <VAR>max</VAR> entries. 700: The history list will contain only <VAR>max</VAR> entries at a time. 701: </DL> 702:  703: 704: <A NAME="IDX12"></A> 705: <DL> 706: <DT>Function: int unstifle_history (void) 707: <DD>Stop stifling the history. This returns the previously-set 708: maximum number of history entries (as set by <CODE>stifle_history()</CODE>). 709: The value is positive if the history was 710: stifled, negative if it wasn't. 711: </DL> 712:  713: 714: <A NAME="IDX13"></A> 715: <DL> 716: <DT>Function: int history_is_stifled (void) 717: <DD>Returns non-zero if the history is stifled, zero if it is not. 718: </DL> 719:  720: 721: <A NAME="Information About the History List"></A> 722: <HR SIZE="6"> 723: <A NAME="SEC12"></A> 724: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 725: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC11"> < </A>]</TD> 726: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC13"> > </A>]</TD> 727: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC13"> << </A>]</TD> 728: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC9"> Up </A>]</TD> 729: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC17"> >> </A>]</TD> 730: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 731: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 732: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 733: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 734: </TR></TABLE> 735: <H3> 2.3.3 Information About the History List </H3> 736:  737:  738: 739: These functions return information about the entire history list or 740: individual list entries. 741:  742: 743: <A NAME="IDX14"></A> 744: <DL> 745: <DT>Function: HIST_ENTRY ** history_list (void) 746: <DD>Return a <CODE>NULL</CODE> terminated array of <CODE>HIST_ENTRY *</CODE> which is the 747: current input history. Element 0 of this list is the beginning of time. 748: If there is no history, return <CODE>NULL</CODE>. 749: </DL> 750:  751: 752: <A NAME="IDX15"></A> 753: <DL> 754: <DT>Function: int where_history (void) 755: <DD>Returns the offset of the current history element. 756: </DL> 757:  758: 759: <A NAME="IDX16"></A> 760: <DL> 761: <DT>Function: HIST_ENTRY * current_history (void) 762: <DD>Return the history entry at the current position, as determined by 763: <CODE>where_history()</CODE>. If there is no entry there, return a <CODE>NULL</CODE> 764: pointer. 765: </DL> 766:  767: 768: <A NAME="IDX17"></A> 769: <DL> 770: <DT>Function: HIST_ENTRY * history_get (int offset) 771: <DD>Return the history entry at position <VAR>offset</VAR>. 772: The range of valid 773: values of <VAR>offset</VAR> starts at <CODE>history_base</CODE> and ends at 774: <VAR>history_length</VAR> - 1 (see section <A HREF="history.html#SEC17">2.4 History Variables</A>). 775: If there is no entry there, or if <VAR>offset</VAR> is outside the valid 776: range, return a <CODE>NULL</CODE> pointer. 777: </DL> 778:  779: 780: <A NAME="IDX18"></A> 781: <DL> 782: <DT>Function: time_t history_get_time (HIST_ENTRY *entry) 783: <DD>Return the time stamp associated with the history entry <VAR>entry</VAR>. 784: If the timestamp is missing or invalid, return 0. 785: </DL> 786:  787: 788: <A NAME="IDX19"></A> 789: <DL> 790: <DT>Function: int history_total_bytes (void) 791: <DD>Return the number of bytes that the primary history entries are using. 792: This function returns the sum of the lengths of all the lines in the 793: history. 794: </DL> 795:  796: 797: <A NAME="Moving Around the History List"></A> 798: <HR SIZE="6"> 799: <A NAME="SEC13"></A> 800: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 801: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC12"> < </A>]</TD> 802: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC14"> > </A>]</TD> 803: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC14"> << </A>]</TD> 804: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC9"> Up </A>]</TD> 805: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC17"> >> </A>]</TD> 806: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 807: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 808: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 809: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 810: </TR></TABLE> 811: <H3> 2.3.4 Moving Around the History List </H3> 812:  813:  814: 815: These functions allow the current index into the history list to be 816: set or changed. 817:  818: 819: <A NAME="IDX20"></A> 820: <DL> 821: <DT>Function: int history_set_pos (int pos) 822: <DD>Set the current history offset to <VAR>pos</VAR>, an absolute index 823: into the list. 824: Returns 1 on success, 0 if <VAR>pos</VAR> is less than zero or greater 825: than the number of history entries. 826: </DL> 827:  828: 829: <A NAME="IDX21"></A> 830: <DL> 831: <DT>Function: HIST_ENTRY * previous_history (void) 832: <DD>Back up the current history offset to the previous history entry, and 833: return a pointer to that entry. If there is no previous entry, return 834: a <CODE>NULL</CODE> pointer. 835: </DL> 836:  837: 838: <A NAME="IDX22"></A> 839: <DL> 840: <DT>Function: HIST_ENTRY * next_history (void) 841: <DD>If the current history offset refers to a valid history entry, 842: increment the current history offset. 843: If the possibly-incremented history offset refers to a valid history 844: entry, return a pointer to that entry; 845: otherwise, return a <CODE>BNULL</CODE> pointer. 846: </DL> 847:  848: 849: <A NAME="Searching the History List"></A> 850: <HR SIZE="6"> 851: <A NAME="SEC14"></A> 852: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 853: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC13"> < </A>]</TD> 854: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC15"> > </A>]</TD> 855: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC15"> << </A>]</TD> 856: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC9"> Up </A>]</TD> 857: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC17"> >> </A>]</TD> 858: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 859: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 860: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 861: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 862: </TR></TABLE> 863: <H3> 2.3.5 Searching the History List </H3> 864:  865:  866: 867: These functions allow searching of the history list for entries containing 868: a specific string. Searching may be performed both forward and backward 869: from the current history position. The search may be anchored, 870: meaning that the string must match at the beginning of the history entry. 871: <A NAME="IDX23"></A> 872:  873: 874: <A NAME="IDX24"></A> 875: <DL> 876: <DT>Function: int history_search (const char *string, int direction) 877: <DD>Search the history for <VAR>string</VAR>, starting at the current history offset. 878: If <VAR>direction</VAR> is less than 0, then the search is through 879: previous entries, otherwise through subsequent entries. 880: If <VAR>string</VAR> is found, then 881: the current history index is set to that history entry, and the value 882: returned is the offset in the line of the entry where 883: <VAR>string</VAR> was found. Otherwise, nothing is changed, and a -1 is 884: returned. 885: </DL> 886:  887: 888: <A NAME="IDX25"></A> 889: <DL> 890: <DT>Function: int history_search_prefix (const char *string, int direction) 891: <DD>Search the history for <VAR>string</VAR>, starting at the current history 892: offset. The search is anchored: matching lines must begin with 893: <VAR>string</VAR>. If <VAR>direction</VAR> is less than 0, then the search is 894: through previous entries, otherwise through subsequent entries. 895: If <VAR>string</VAR> is found, then the 896: current history index is set to that entry, and the return value is 0. 897: Otherwise, nothing is changed, and a -1 is returned. 898: </DL> 899:  900: 901: <A NAME="IDX26"></A> 902: <DL> 903: <DT>Function: int history_search_pos (const char *string, int direction, int pos) 904: <DD>Search for <VAR>string</VAR> in the history list, starting at <VAR>pos</VAR>, an 905: absolute index into the list. If <VAR>direction</VAR> is negative, the search 906: proceeds backward from <VAR>pos</VAR>, otherwise forward. Returns the absolute 907: index of the history element where <VAR>string</VAR> was found, or -1 otherwise. 908: </DL> 909:  910: 911: <A NAME="Managing the History File"></A> 912: <HR SIZE="6"> 913: <A NAME="SEC15"></A> 914: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 915: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC14"> < </A>]</TD> 916: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC16"> > </A>]</TD> 917: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC16"> << </A>]</TD> 918: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC9"> Up </A>]</TD> 919: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC17"> >> </A>]</TD> 920: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 921: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 922: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 923: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 924: </TR></TABLE> 925: <H3> 2.3.6 Managing the History File </H3> 926:  927:  928: 929: The History library can read the history from and write it to a file. 930: This section documents the functions for managing a history file. 931:  932: 933: <A NAME="IDX27"></A> 934: <DL> 935: <DT>Function: int read_history (const char *filename) 936: <DD>Add the contents of <VAR>filename</VAR> to the history list, a line at a time. 937: If <VAR>filename</VAR> is <CODE>NULL</CODE>, then read from <TT>`~/.history'</TT>. 938: Returns 0 if successful, or <CODE>errno</CODE> if not. 939: </DL> 940:  941: 942: <A NAME="IDX28"></A> 943: <DL> 944: <DT>Function: int read_history_range (const char *filename, int from, int to) 945: <DD>Read a range of lines from <VAR>filename</VAR>, adding them to the history list. 946: Start reading at line <VAR>from</VAR> and end at <VAR>to</VAR>. 947: If <VAR>from</VAR> is zero, start at the beginning. If <VAR>to</VAR> is less than 948: <VAR>from</VAR>, then read until the end of the file. If <VAR>filename</VAR> is 949: <CODE>NULL</CODE>, then read from <TT>`~/.history'</TT>. Returns 0 if successful, 950: or <CODE>errno</CODE> if not. 951: </DL> 952:  953: 954: <A NAME="IDX29"></A> 955: <DL> 956: <DT>Function: int write_history (const char *filename) 957: <DD>Write the current history to <VAR>filename</VAR>, overwriting <VAR>filename</VAR> 958: if necessary. 959: If <VAR>filename</VAR> is <CODE>NULL</CODE>, then write the history list to 960: <TT>`~/.history'</TT>. 961: Returns 0 on success, or <CODE>errno</CODE> on a read or write error. 962: </DL> 963:  964: 965: <A NAME="IDX30"></A> 966: <DL> 967: <DT>Function: int append_history (int nelements, const char *filename) 968: <DD>Append the last <VAR>nelements</VAR> of the history list to <VAR>filename</VAR>. 969: If <VAR>filename</VAR> is <CODE>NULL</CODE>, then append to <TT>`~/.history'</TT>. 970: Returns 0 on success, or <CODE>errno</CODE> on a read or write error. 971: </DL> 972:  973: 974: <A NAME="IDX31"></A> 975: <DL> 976: <DT>Function: int history_truncate_file (const char *filename, int nlines) 977: <DD>Truncate the history file <VAR>filename</VAR>, leaving only the last 978: <VAR>nlines</VAR> lines. 979: If <VAR>filename</VAR> is <CODE>NULL</CODE>, then <TT>`~/.history'</TT> is truncated. 980: Returns 0 on success, or <CODE>errno</CODE> on failure. 981: </DL> 982:  983: 984: <A NAME="History Expansion"></A> 985: <HR SIZE="6"> 986: <A NAME="SEC16"></A> 987: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 988: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC15"> < </A>]</TD> 989: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC17"> > </A>]</TD> 990: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC17"> << </A>]</TD> 991: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC9"> Up </A>]</TD> 992: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC17"> >> </A>]</TD> 993: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 994: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 995: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 996: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 997: </TR></TABLE> 998: <H3> 2.3.7 History Expansion </H3> 999:  1000:  1001: 1002: These functions implement history expansion. 1003:  1004: 1005: <A NAME="IDX32"></A> 1006: <DL> 1007: <DT>Function: int history_expand (char *string, char **output) 1008: <DD>Expand <VAR>string</VAR>, placing the result into <VAR>output</VAR>, a pointer 1009: to a string (see section <A HREF="history.html#SEC2">1.1 History Expansion</A>). Returns: 1010: <DL COMPACT> 1011: <DT><CODE>0</CODE> 1012: <DD>If no expansions took place (or, if the only change in 1013: the text was the removal of escape characters preceding the history expansion 1014: character); 1015: <DT><CODE>1</CODE> 1016: <DD>if expansions did take place; 1017: <DT><CODE>-1</CODE> 1018: <DD>if there was an error in expansion; 1019: <DT><CODE>2</CODE> 1020: <DD>if the returned line should be displayed, but not executed, 1021: as with the <CODE>:p</CODE> modifier (see section <A HREF="history.html#SEC5">1.1.3 Modifiers</A>). 1022: </DL> 1023:  1024: 1025: If an error occurred in expansion, then <VAR>output</VAR> contains a descriptive 1026: error message. 1027: </DL> 1028:  1029: 1030: <A NAME="IDX33"></A> 1031: <DL> 1032: <DT>Function: char * get_history_event (const char *string, int *cindex, int qchar) 1033: <DD>Returns the text of the history event beginning at <VAR>string</VAR> + 1034: <VAR>*cindex</VAR>. <VAR>*cindex</VAR> is modified to point to after the event 1035: specifier. At function entry, <VAR>cindex</VAR> points to the index into 1036: <VAR>string</VAR> where the history event specification begins. <VAR>qchar</VAR> 1037: is a character that is allowed to end the event specification in addition 1038: to the "normal" terminating characters. 1039: </DL> 1040:  1041: 1042: <A NAME="IDX34"></A> 1043: <DL> 1044: <DT>Function: char ** history_tokenize (const char *string) 1045: <DD>Return an array of tokens parsed out of <VAR>string</VAR>, much as the 1046: shell might. The tokens are split on the characters in the 1047: <VAR>history_word_delimiters</VAR> variable, 1048: and shell quoting conventions are obeyed as described below. 1049: </DL> 1050:  1051: 1052: <A NAME="IDX35"></A> 1053: <DL> 1054: <DT>Function: char * history_arg_extract (int first, int last, const char *string) 1055: <DD>Extract a string segment consisting of the <VAR>first</VAR> through <VAR>last</VAR> 1056: arguments present in <VAR>string</VAR>. Arguments are split using 1057: <CODE>history_tokenize</CODE>. 1058: </DL> 1059:  1060: 1061: <A NAME="History Variables"></A> 1062: <HR SIZE="6"> 1063: <A NAME="SEC17"></A> 1064: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 1065: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC16"> < </A>]</TD> 1066: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC18"> > </A>]</TD> 1067: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC18"> << </A>]</TD> 1068: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC6"> Up </A>]</TD> 1069: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC19"> >> </A>]</TD> 1070: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 1071: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 1072: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 1073: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 1074: </TR></TABLE> 1075: <H2> 2.4 History Variables </H2> 1076:  1077:  1078: 1079: This section describes the externally-visible variables exported by 1080: the GNU History Library. 1081:  1082: 1083: <A NAME="IDX36"></A> 1084: <DL> 1085: <DT>Variable: int history_base 1086: <DD>The logical offset of the first entry in the history list. 1087: </DL> 1088:  1089: 1090: <A NAME="IDX37"></A> 1091: <DL> 1092: <DT>Variable: int history_length 1093: <DD>The number of entries currently stored in the history list. 1094: </DL> 1095:  1096: 1097: <A NAME="IDX38"></A> 1098: <DL> 1099: <DT>Variable: int history_max_entries 1100: <DD>The maximum number of history entries. This must be changed using 1101: <CODE>stifle_history()</CODE>. 1102: </DL> 1103:  1104: 1105: <A NAME="IDX39"></A> 1106: <DL> 1107: <DT>Variable: int history_write_timestamps 1108: <DD>If non-zero, timestamps are written to the history file, so they can be 1109: preserved between sessions. The default value is 0, meaning that 1110: timestamps are not saved. 1111:  1112: 1113: The current timestamp format uses the value of <VAR>history_comment_char</VAR> 1114: to delimit timestamp entries in the history file. If that variable does 1115: not have a value (the default), timestamps will not be written. 1116: </DL> 1117:  1118: 1119: <A NAME="IDX40"></A> 1120: <DL> 1121: <DT>Variable: char history_expansion_char 1122: <DD>The character that introduces a history event. The default is <SAMP>`!'</SAMP>. 1123: Setting this to 0 inhibits history expansion. 1124: </DL> 1125:  1126: 1127: <A NAME="IDX41"></A> 1128: <DL> 1129: <DT>Variable: char history_subst_char 1130: <DD>The character that invokes word substitution if found at the start of 1131: a line. The default is <SAMP>`^'</SAMP>. 1132: </DL> 1133:  1134: 1135: <A NAME="IDX42"></A> 1136: <DL> 1137: <DT>Variable: char history_comment_char 1138: <DD>During tokenization, if this character is seen as the first character 1139: of a word, then it and all subsequent characters up to a newline are 1140: ignored, suppressing history expansion for the remainder of the line. 1141: This is disabled by default. 1142: </DL> 1143:  1144: 1145: <A NAME="IDX43"></A> 1146: <DL> 1147: <DT>Variable: char * history_word_delimiters 1148: <DD>The characters that separate tokens for <CODE>history_tokenize()</CODE>. 1149: The default value is <CODE>" \t\n()<>;&|"</CODE>. 1150: </DL> 1151: 1152: 1153: <A NAME="IDX44"></A> 1154: <DL> 1155: <DT>Variable: char * history_search_delimiter_chars 1156: <DD>The list of additional characters which can delimit a history search 1157: string, in addition to space, TAB, <SAMP>`:'</SAMP> and <SAMP>`?'</SAMP> in the case of 1158: a substring search. The default is empty. 1159: </DL> 1160: 1161: 1162: <A NAME="IDX45"></A> 1163: <DL> 1164: <DT>Variable: char * history_no_expand_chars 1165: <DD>The list of characters which inhibit history expansion if found immediately 1166: following <VAR>history_expansion_char</VAR>. The default is space, tab, newline, 1167: carriage return, and <SAMP>`='</SAMP>. 1168: </DL> 1169: 1170: 1171: <A NAME="IDX46"></A> 1172: <DL> 1173: <DT>Variable: int history_quotes_inhibit_expansion 1174: <DD>If non-zero, the history expansion code implements shell-like quoting: 1175: single-quoted words are not scanned for the history expansion 1176: character or the history comment character, and double-quoted words may 1177: have history expansion performed, since single quotes are not special 1178: within double quotes. 1179: The default value is 0. 1180: </DL> 1181: 1182: 1183: <A NAME="IDX47"></A> 1184: <DL> 1185: <DT>Variable: int history_quoting_state 1186: <DD>An application may set this variable to indicate that the current line 1187: being expanded is subject to existing quoting. If set to <SAMP>`''</SAMP>, the 1188: history expansion function will assume that the line is single-quoted and 1189: inhibit expansion until it reads an unquoted closing single quote; if set 1190: to <SAMP>`"'</SAMP>, history expansion will assume the line is double quoted until 1191: it reads an unquoted closing double quote. If set to zero, the default, 1192: the history expansion function will assume the line is not quoted and 1193: treat quote characters within the line as described above. 1194: This is only effective if <VAR>history_quotes_inhibit_expansion</VAR> is set. 1195: </DL> 1196:  1197: 1198: <A NAME="IDX48"></A> 1199: <DL> 1200: <DT>Variable: rl_linebuf_func_t * history_inhibit_expansion_function 1201: <DD>This should be set to the address of a function that takes two arguments: 1202: a <CODE>char *</CODE> (<VAR>string</VAR>) 1203: and an <CODE>int</CODE> index into that string (<VAR>i</VAR>). 1204: It should return a non-zero value if the history expansion starting at 1205: <VAR>string[i]</VAR> should not be performed; zero if the expansion should 1206: be done. 1207: It is intended for use by applications like Bash that use the history 1208: expansion character for additional purposes. 1209: By default, this variable is set to <CODE>NULL</CODE>. 1210: </DL> 1211:  1212: 1213: <A NAME="History Programming Example"></A> 1214: <HR SIZE="6"> 1215: <A NAME="SEC18"></A> 1216: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 1217: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC17"> < </A>]</TD> 1218: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC19"> > </A>]</TD> 1219: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[ << ]</TD> 1220: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC6"> Up </A>]</TD> 1221: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC19"> >> </A>]</TD> 1222: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 1223: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 1224: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 1225: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 1226: </TR></TABLE> 1227: <H2> 2.5 History Programming Example </H2> 1228:  1229:  1230: 1231: The following program demonstrates simple use of the GNU History Library. 1232:  1233: 1234: <TABLE><tr><td> </td><td class=smallexample><pre>#include <stdio.h> 1235: #include <readline/history.h> 1236: 1237: main (argc, argv) 1238: int argc; 1239: char **argv; 1240: { 1241: char line[1024], *t; 1242: int len, done = 0; 1243: 1244: line[0] = 0; 1245: 1246: using_history (); 1247: while (!done) 1248: { 1249: printf ("history$ "); 1250: fflush (stdout); 1251: t = fgets (line, sizeof (line) - 1, stdin); 1252: if (t && *t) 1253: { 1254: len = strlen (t); 1255: if (t[len - 1] == '\n') 1256: t[len - 1] = '\0'; 1257: } 1258: 1259: if (!t) 1260: strcpy (line, "quit"); 1261: 1262: if (line[0]) 1263: { 1264: char *expansion; 1265: int result; 1266: 1267: result = history_expand (line, &expansion); 1268: if (result) 1269: fprintf (stderr, "%s\n", expansion); 1270: 1271: if (result < 0 || result == 2) 1272: { 1273: free (expansion); 1274: continue; 1275: } 1276: 1277: add_history (expansion); 1278: strncpy (line, expansion, sizeof (line) - 1); 1279: free (expansion); 1280: } 1281: 1282: if (strcmp (line, "quit") == 0) 1283: done = 1; 1284: else if (strcmp (line, "save") == 0) 1285: write_history ("history_file"); 1286: else if (strcmp (line, "read") == 0) 1287: read_history ("history_file"); 1288: else if (strcmp (line, "list") == 0) 1289: { 1290: register HIST_ENTRY **the_list; 1291: register int i; 1292: 1293: the_list = history_list (); 1294: if (the_list) 1295: for (i = 0; the_list[i]; i++) 1296: printf ("%d: %s\n", i + history_base, the_list[i]->line); 1297: } 1298: else if (strncmp (line, "delete", 6) == 0) 1299: { 1300: int which; 1301: if ((sscanf (line + 6, "%d", &which)) == 1) 1302: { 1303: HIST_ENTRY *entry = remove_history (which); 1304: if (!entry) 1305: fprintf (stderr, "No such entry %d\n", which); 1306: else 1307: { 1308: free (entry->line); 1309: free (entry); 1310: } 1311: } 1312: else 1313: { 1314: fprintf (stderr, "non-numeric arg given to `delete'\n"); 1315: } 1316: } 1317: } 1318: } 1319: </pre></td></tr></table> 1320: 1321: <A NAME="GNU Free Documentation License"></A> 1322: <HR SIZE="6"> 1323: <A NAME="SEC19"></A> 1324: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 1325: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC18"> < </A>]</TD> 1326: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21"> > </A>]</TD> 1327: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC6"> << </A>]</TD> 1328: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top"> Up </A>]</TD> 1329: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21"> >> </A>]</TD> 1330: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 1331: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 1332: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 1333: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 1334: </TR></TABLE> 1335: <H1> A. GNU Free Documentation License </H1> 1336:  1337:  1338: 1339: <center> 1340: Version 1.3, 3 November 2008 1341: </center> 1342:  1343: 1344: <TABLE><tr><td> </td><td class=display><pre style="font-family: serif">Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc. 1345: <A HREF="http://fsf.org/">http://fsf.org/</A> 1346: 1347: Everyone is permitted to copy and distribute verbatim copies 1348: of this license document, but changing it is not allowed. 1349: </pre></td></tr></table> 1350: 1351: <OL> 1352: <LI> 1353: PREAMBLE 1354:  1355: 1356: The purpose of this License is to make a manual, textbook, or other 1357: functional and useful document free in the sense of freedom: to 1358: assure everyone the effective freedom to copy and redistribute it, 1359: with or without modifying it, either commercially or noncommercially. 1360: Secondarily, this License preserves for the author and publisher a way 1361: to get credit for their work, while not being considered responsible 1362: for modifications made by others. 1363:  1364: 1365: This License is a kind of "copyleft", which means that derivative 1366: works of the document must themselves be free in the same sense. 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For works in 1458: formats which do not have any title page as such, "Title Page" means 1459: the text near the most prominent appearance of the work's title, 1460: preceding the beginning of the body of the text. 1461:  1462: 1463: The "publisher" means any person or entity that distributes copies 1464: of the Document to the public. 1465:  1466: 1467: A section "Entitled XYZ" means a named subunit of the Document whose 1468: title either is precisely XYZ or contains XYZ in parentheses following 1469: text that translates XYZ in another language. (Here XYZ stands for a 1470: specific section name mentioned below, such as "Acknowledgements", 1471: "Dedications", "Endorsements", or "History".) To "Preserve the Title" 1472: of such a section when you modify the Document means that it remains a 1473: section "Entitled XYZ" according to this definition. 1474:  1475: 1476: The Document may include Warranty Disclaimers next to the notice which 1477: states that this License applies to the Document. These Warranty 1478: Disclaimers are considered to be included by reference in this 1479: License, but only as regards disclaiming warranties: any other 1480: implication that these Warranty Disclaimers may have is void and has 1481: no effect on the meaning of this License. 1482:  1483: 1484: <LI> 1485: VERBATIM COPYING 1486:  1487: 1488: You may copy and distribute the Document in any medium, either 1489: commercially or noncommercially, provided that this License, the 1490: copyright notices, and the license notice saying this License applies 1491: to the Document are reproduced in all copies, and that you add no other 1492: conditions whatsoever to those of this License. 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The front cover must present 1514: the full title with all words of the title equally prominent and 1515: visible. You may add other material on the covers in addition. 1516: Copying with changes limited to the covers, as long as they preserve 1517: the title of the Document and satisfy these conditions, can be treated 1518: as verbatim copying in other respects. 1519:  1520: 1521: If the required texts for either cover are too voluminous to fit 1522: legibly, you should put the first ones listed (as many as fit 1523: reasonably) on the actual cover, and continue the rest onto adjacent 1524: pages. 1525:  1526: 1527: If you publish or distribute Opaque copies of the Document numbering 1528: more than 100, you must either include a machine-readable Transparent 1529: copy along with each Opaque copy, or state in or with each Opaque copy 1530: a computer-network location from which the general network-using 1531: public has access to download using public-standard network protocols 1532: a complete Transparent copy of the Document, free of added material. 1533: If you use the latter option, you must take reasonably prudent steps, 1534: when you begin distribution of Opaque copies in quantity, to ensure 1535: that this Transparent copy will remain thus accessible at the stated 1536: location until at least one year after the last time you distribute an 1537: Opaque copy (directly or through your agents or retailers) of that 1538: edition to the public. 1539:  1540: 1541: It is requested, but not required, that you contact the authors of the 1542: Document well before redistributing any large number of copies, to give 1543: them a chance to provide you with an updated version of the Document. 1544:  1545: 1546: <LI> 1547: MODIFICATIONS 1548:  1549: 1550: You may copy and distribute a Modified Version of the Document under 1551: the conditions of sections 2 and 3 above, provided that you release 1552: the Modified Version under precisely this License, with the Modified 1553: Version filling the role of the Document, thus licensing distribution 1554: and modification of the Modified Version to whoever possesses a copy 1555: of it. In addition, you must do these things in the Modified Version: 1556:  1557: 1558: <OL> 1559: <LI> 1560: Use in the Title Page (and on the covers, if any) a title distinct 1561: from that of the Document, and from those of previous versions 1562: (which should, if there were any, be listed in the History section 1563: of the Document). You may use the same title as a previous version 1564: if the original publisher of that version gives permission. 1565:  1566: 1567: <LI> 1568: List on the Title Page, as authors, one or more persons or entities 1569: responsible for authorship of the modifications in the Modified 1570: Version, together with at least five of the principal authors of the 1571: Document (all of its principal authors, if it has fewer than five), 1572: unless they release you from this requirement. 1573:  1574: 1575: <LI> 1576: State on the Title page the name of the publisher of the 1577: Modified Version, as the publisher. 1578:  1579: 1580: <LI> 1581: Preserve all the copyright notices of the Document. 1582:  1583: 1584: <LI> 1585: Add an appropriate copyright notice for your modifications 1586: adjacent to the other copyright notices. 1587:  1588: 1589: <LI> 1590: Include, immediately after the copyright notices, a license notice 1591: giving the public permission to use the Modified Version under the 1592: terms of this License, in the form shown in the Addendum below. 1593:  1594: 1595: <LI> 1596: Preserve in that license notice the full lists of Invariant Sections 1597: and required Cover Texts given in the Document's license notice. 1598:  1599: 1600: <LI> 1601: Include an unaltered copy of this License. 1602:  1603: 1604: <LI> 1605: Preserve the section Entitled "History", Preserve its Title, and add 1606: to it an item stating at least the title, year, new authors, and 1607: publisher of the Modified Version as given on the Title Page. If 1608: there is no section Entitled "History" in the Document, create one 1609: stating the title, year, authors, and publisher of the Document as 1610: given on its Title Page, then add an item describing the Modified 1611: Version as stated in the previous sentence. 1612:  1613: 1614: <LI> 1615: Preserve the network location, if any, given in the Document for 1616: public access to a Transparent copy of the Document, and likewise 1617: the network locations given in the Document for previous versions 1618: it was based on. These may be placed in the "History" section. 1619: You may omit a network location for a work that was published at 1620: least four years before the Document itself, or if the original 1621: publisher of the version it refers to gives permission. 1622:  1623: 1624: <LI> 1625: For any section Entitled "Acknowledgements" or "Dedications", Preserve 1626: the Title of the section, and preserve in the section all the 1627: substance and tone of each of the contributor acknowledgements and/or 1628: dedications given therein. 1629:  1630: 1631: <LI> 1632: Preserve all the Invariant Sections of the Document, 1633: unaltered in their text and in their titles. Section numbers 1634: or the equivalent are not considered part of the section titles. 1635:  1636: 1637: <LI> 1638: Delete any section Entitled "Endorsements". Such a section 1639: may not be included in the Modified Version. 1640:  1641: 1642: <LI> 1643: Do not retitle any existing section to be Entitled "Endorsements" or 1644: to conflict in title with any Invariant Section. 1645:  1646: 1647: <LI> 1648: Preserve any Warranty Disclaimers. 1649: </OL> 1650:  1651: 1652: If the Modified Version includes new front-matter sections or 1653: appendices that qualify as Secondary Sections and contain no material 1654: copied from the Document, you may at your option designate some or all 1655: of these sections as invariant. To do this, add their titles to the 1656: list of Invariant Sections in the Modified Version's license notice. 1657: These titles must be distinct from any other section titles. 1658:  1659: 1660: You may add a section Entitled "Endorsements", provided it contains 1661: nothing but endorsements of your Modified Version by various 1662: parties--for example, statements of peer review or that the text has 1663: been approved by an organization as the authoritative definition of a 1664: standard. 1665:  1666: 1667: You may add a passage of up to five words as a Front-Cover Text, and a 1668: passage of up to 25 words as a Back-Cover Text, to the end of the list 1669: of Cover Texts in the Modified Version. Only one passage of 1670: Front-Cover Text and one of Back-Cover Text may be added by (or 1671: through arrangements made by) any one entity. If the Document already 1672: includes a cover text for the same cover, previously added by you or 1673: by arrangement made by the same entity you are acting on behalf of, 1674: you may not add another; but you may replace the old one, on explicit 1675: permission from the previous publisher that added the old one. 1676:  1677: 1678: The author(s) and publisher(s) of the Document do not by this License 1679: give permission to use their names for publicity for or to assert or 1680: imply endorsement of any Modified Version. 1681:  1682: 1683: <LI> 1684: COMBINING DOCUMENTS 1685:  1686: 1687: You may combine the Document with other documents released under this 1688: License, under the terms defined in section 4 above for modified 1689: versions, provided that you include in the combination all of the 1690: Invariant Sections of all of the original documents, unmodified, and 1691: list them all as Invariant Sections of your combined work in its 1692: license notice, and that you preserve all their Warranty Disclaimers. 1693:  1694: 1695: The combined work need only contain one copy of this License, and 1696: multiple identical Invariant Sections may be replaced with a single 1697: copy. If there are multiple Invariant Sections with the same name but 1698: different contents, make the title of each such section unique by 1699: adding at the end of it, in parentheses, the name of the original 1700: author or publisher of that section if known, or else a unique number. 1701: Make the same adjustment to the section titles in the list of 1702: Invariant Sections in the license notice of the combined work. 1703:  1704: 1705: In the combination, you must combine any sections Entitled "History" 1706: in the various original documents, forming one section Entitled 1707: "History"; likewise combine any sections Entitled "Acknowledgements", 1708: and any sections Entitled "Dedications". You must delete all 1709: sections Entitled "Endorsements." 1710:  1711: 1712: <LI> 1713: COLLECTIONS OF DOCUMENTS 1714:  1715: 1716: You may make a collection consisting of the Document and other documents 1717: released under this License, and replace the individual copies of this 1718: License in the various documents with a single copy that is included in 1719: the collection, provided that you follow the rules of this License for 1720: verbatim copying of each of the documents in all other respects. 1721:  1722: 1723: You may extract a single document from such a collection, and distribute 1724: it individually under this License, provided you insert a copy of this 1725: License into the extracted document, and follow this License in all 1726: other respects regarding verbatim copying of that document. 1727:  1728: 1729: <LI> 1730: AGGREGATION WITH INDEPENDENT WORKS 1731:  1732: 1733: A compilation of the Document or its derivatives with other separate 1734: and independent documents or works, in or on a volume of a storage or 1735: distribution medium, is called an "aggregate" if the copyright 1736: resulting from the compilation is not used to limit the legal rights 1737: of the compilation's users beyond what the individual works permit. 1738: When the Document is included in an aggregate, this License does not 1739: apply to the other works in the aggregate which are not themselves 1740: derivative works of the Document. 1741:  1742: 1743: If the Cover Text requirement of section 3 is applicable to these 1744: copies of the Document, then if the Document is less than one half of 1745: the entire aggregate, the Document's Cover Texts may be placed on 1746: covers that bracket the Document within the aggregate, or the 1747: electronic equivalent of covers if the Document is in electronic form. 1748: Otherwise they must appear on printed covers that bracket the whole 1749: aggregate. 1750:  1751: 1752: <LI> 1753: TRANSLATION 1754:  1755: 1756: Translation is considered a kind of modification, so you may 1757: distribute translations of the Document under the terms of section 4. 1758: Replacing Invariant Sections with translations requires special 1759: permission from their copyright holders, but you may include 1760: translations of some or all Invariant Sections in addition to the 1761: original versions of these Invariant Sections. You may include a 1762: translation of this License, and all the license notices in the 1763: Document, and any Warranty Disclaimers, provided that you also include 1764: the original English version of this License and the original versions 1765: of those notices and disclaimers. In case of a disagreement between 1766: the translation and the original version of this License or a notice 1767: or disclaimer, the original version will prevail. 1768:  1769: 1770: If a section in the Document is Entitled "Acknowledgements", 1771: "Dedications", or "History", the requirement (section 4) to Preserve 1772: its Title (section 1) will typically require changing the actual 1773: title. 1774:  1775: 1776: <LI> 1777: TERMINATION 1778:  1779: 1780: You may not copy, modify, sublicense, or distribute the Document 1781: except as expressly provided under this License. Any attempt 1782: otherwise to copy, modify, sublicense, or distribute it is void, and 1783: will automatically terminate your rights under this License. 1784:  1785: 1786: However, if you cease all violation of this License, then your license 1787: from a particular copyright holder is reinstated (a) provisionally, 1788: unless and until the copyright holder explicitly and finally 1789: terminates your license, and (b) permanently, if the copyright holder 1790: fails to notify you of the violation by some reasonable means prior to 1791: 60 days after the cessation. 1792:  1793: 1794: Moreover, your license from a particular copyright holder is 1795: reinstated permanently if the copyright holder notifies you of the 1796: violation by some reasonable means, this is the first time you have 1797: received notice of violation of this License (for any work) from that 1798: copyright holder, and you cure the violation prior to 30 days after 1799: your receipt of the notice. 1800:  1801: 1802: Termination of your rights under this section does not terminate the 1803: licenses of parties who have received copies or rights from you under 1804: this License. If your rights have been terminated and not permanently 1805: reinstated, receipt of a copy of some or all of the same material does 1806: not give you any rights to use it. 1807:  1808: 1809: <LI> 1810: FUTURE REVISIONS OF THIS LICENSE 1811:  1812: 1813: The Free Software Foundation may publish new, revised versions 1814: of the GNU Free Documentation License from time to time. Such new 1815: versions will be similar in spirit to the present version, but may 1816: differ in detail to address new problems or concerns. See 1817: <A HREF="http://www.gnu.org/copyleft/">http://www.gnu.org/copyleft/</A>. 1818:  1819: 1820: Each version of the License is given a distinguishing version number. 1821: If the Document specifies that a particular numbered version of this 1822: License "or any later version" applies to it, you have the option of 1823: following the terms and conditions either of that specified version or 1824: of any later version that has been published (not as a draft) by the 1825: Free Software Foundation. If the Document does not specify a version 1826: number of this License, you may choose any version ever published (not 1827: as a draft) by the Free Software Foundation. If the Document 1828: specifies that a proxy can decide which future versions of this 1829: License can be used, that proxy's public statement of acceptance of a 1830: version permanently authorizes you to choose that version for the 1831: Document. 1832:  1833: 1834: <LI> 1835: RELICENSING 1836:  1837: 1838: "Massive Multiauthor Collaboration Site" (or "MMC Site") means any 1839: World Wide Web server that publishes copyrightable works and also 1840: provides prominent facilities for anybody to edit those works. A 1841: public wiki that anybody can edit is an example of such a server. A 1842: "Massive Multiauthor Collaboration" (or "MMC") contained in the 1843: site means any set of copyrightable works thus published on the MMC 1844: site. 1845:  1846: 1847: "CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0 1848: license published by Creative Commons Corporation, a not-for-profit 1849: corporation with a principal place of business in San Francisco, 1850: California, as well as future copyleft versions of that license 1851: published by that same organization. 1852:  1853: 1854: "Incorporate" means to publish or republish a Document, in whole or 1855: in part, as part of another Document. 1856:  1857: 1858: An MMC is "eligible for relicensing" if it is licensed under this 1859: License, and if all works that were first published under this License 1860: somewhere other than this MMC, and subsequently incorporated in whole 1861: or in part into the MMC, (1) had no cover texts or invariant sections, 1862: and (2) were thus incorporated prior to November 1, 2008. 1863:  1864: 1865: The operator of an MMC Site may republish an MMC contained in the site 1866: under CC-BY-SA on the same site at any time before August 1, 2009, 1867: provided the MMC is eligible for relicensing. 1868:  1869: 1870: </OL> 1871:  1872: 1873: <A NAME="SEC20"></A> 1874: <H2> ADDENDUM: How to use this License for your documents </H2> 1875:  1876:  1877: 1878: To use this License in a document you have written, include a copy of 1879: the License in the document and put the following copyright and 1880: license notices just after the title page: 1881:  1882: 1883: <TABLE><tr><td> </td><td class=smallexample><pre> Copyright (C) <VAR>year</VAR> <VAR>your name</VAR>. 1884: Permission is granted to copy, distribute and/or modify this document 1885: under the terms of the GNU Free Documentation License, Version 1.3 1886: or any later version published by the Free Software Foundation; 1887: with no Invariant Sections, no Front-Cover Texts, and no Back-Cover 1888: Texts. A copy of the license is included in the section entitled ``GNU 1889: Free Documentation License''. 1890: </pre></td></tr></table> 1891: 1892: If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, 1893: replace the "with...Texts." line with this: 1894:  1895: 1896: <TABLE><tr><td> </td><td class=smallexample><pre> with the Invariant Sections being <VAR>list their titles</VAR>, with 1897: the Front-Cover Texts being <VAR>list</VAR>, and with the Back-Cover Texts 1898: being <VAR>list</VAR>. 1899: </pre></td></tr></table> 1900: 1901: If you have Invariant Sections without Cover Texts, or some other 1902: combination of the three, merge those two alternatives to suit the 1903: situation. 1904:  1905: 1906: If your document contains nontrivial examples of program code, we 1907: recommend releasing these examples in parallel under your choice of 1908: free software license, such as the GNU General Public License, 1909: to permit their use in free software. 1910:  1911: 1912: <A NAME="Concept Index"></A> 1913: <HR SIZE="6"> 1914: <A NAME="SEC21"></A> 1915: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 1916: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC19"> < </A>]</TD> 1917: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC22"> > </A>]</TD> 1918: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC22"> << </A>]</TD> 1919: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top"> Up </A>]</TD> 1920: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC22"> >> </A>]</TD> 1921: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 1922: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 1923: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 1924: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 1925: </TR></TABLE> 1926: <H1> B. Concept Index </H1> 1927:  1928: <table><tr><th valign=top>Jump to:   </th><td><A HREF="history.html#cp_A" style="text-decoration:none">A</A> 1929:   1930: <A HREF="history.html#cp_E" style="text-decoration:none">E</A> 1931:   1932: <A HREF="history.html#cp_H" style="text-decoration:none">H</A> 1933:   1934: </td></tr></table>  1935: <TABLE border=0> 1936: <TR><TD></TD><TH ALIGN=LEFT>Index Entry</TH><TH ALIGN=LEFT> Section</TH></TR> 1937: <TR><TD COLSPAN=3> <HR></TD></TR> 1938: <TR><TH><A NAME="cp_A"></A>A</TH><TD></TD><TD></TD></TR> 1939: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX23">anchored search</A></TD><TD valign=top><A HREF="history.html#SEC14">2.3.5 Searching the History List</A></TD></TR> 1940: <TR><TD COLSPAN=3> <HR></TD></TR> 1941: <TR><TH><A NAME="cp_E"></A>E</TH><TD></TD><TD></TD></TR> 1942: <TR><TD></TD><TD valign=top><A HREF="history.html#SEC3">event designators</A></TD><TD valign=top><A HREF="history.html#SEC3">1.1.1 Event Designators</A></TD></TR> 1943: <TR><TD COLSPAN=3> <HR></TD></TR> 1944: <TR><TH><A NAME="cp_H"></A>H</TH><TD></TD><TD></TD></TR> 1945: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX1">history events</A></TD><TD valign=top><A HREF="history.html#SEC3">1.1.1 Event Designators</A></TD></TR> 1946: <TR><TD></TD><TD valign=top><A HREF="history.html#SEC2">history expansion</A></TD><TD valign=top><A HREF="history.html#SEC2">1.1 History Expansion</A></TD></TR> 1947: <TR><TD></TD><TD valign=top><A HREF="history.html#SEC14">History Searching</A></TD><TD valign=top><A HREF="history.html#SEC14">2.3.5 Searching the History List</A></TD></TR> 1948: <TR><TD COLSPAN=3> <HR></TD></TR> 1949: </TABLE><table><tr><th valign=top>Jump to:   </th><td><A HREF="history.html#cp_A" style="text-decoration:none">A</A> 1950:   1951: <A HREF="history.html#cp_E" style="text-decoration:none">E</A> 1952:   1953: <A HREF="history.html#cp_H" style="text-decoration:none">H</A> 1954:   1955: </td></tr></table>  1956: 1957: <A NAME="Function and Variable Index"></A> 1958: <HR SIZE="6"> 1959: <A NAME="SEC22"></A> 1960: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 1961: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21"> < </A>]</TD> 1962: <TD VALIGN="MIDDLE" ALIGN="LEFT">[ > ]</TD> 1963: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[ << ]</TD> 1964: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top"> Up </A>]</TD> 1965: <TD VALIGN="MIDDLE" ALIGN="LEFT">[ >> ]</TD> 1966: <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">   <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 1967: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 1968: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 1969: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 1970: </TR></TABLE> 1971: <H1> C. Function and Variable Index </H1> 1972:  1973: <table><tr><th valign=top>Jump to:   </th><td><A HREF="history.html#vr_A" style="text-decoration:none">A</A> 1974:   1975: <A HREF="history.html#vr_C" style="text-decoration:none">C</A> 1976:   1977: <A HREF="history.html#vr_F" style="text-decoration:none">F</A> 1978:   1979: <A HREF="history.html#vr_G" style="text-decoration:none">G</A> 1980:   1981: <A HREF="history.html#vr_H" style="text-decoration:none">H</A> 1982:   1983: <A HREF="history.html#vr_N" style="text-decoration:none">N</A> 1984:   1985: <A HREF="history.html#vr_P" style="text-decoration:none">P</A> 1986:   1987: <A HREF="history.html#vr_R" style="text-decoration:none">R</A> 1988:   1989: <A HREF="history.html#vr_S" style="text-decoration:none">S</A> 1990:   1991: <A HREF="history.html#vr_U" style="text-decoration:none">U</A> 1992:   1993: <A HREF="history.html#vr_W" style="text-decoration:none">W</A> 1994:   1995: </td></tr></table>  1996: <TABLE border=0> 1997: <TR><TD></TD><TH ALIGN=LEFT>Index Entry</TH><TH ALIGN=LEFT> Section</TH></TR> 1998: <TR><TD COLSPAN=3> <HR></TD></TR> 1999: <TR><TH><A NAME="vr_A"></A>A</TH><TD></TD><TD></TD></TR> 2000: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX5"><CODE>add_history</CODE></A></TD><TD valign=top><A HREF="history.html#SEC11">2.3.2 History List Management</A></TD></TR> 2001: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX6"><CODE>add_history_time</CODE></A></TD><TD valign=top><A HREF="history.html#SEC11">2.3.2 History List Management</A></TD></TR> 2002: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX30"><CODE>append_history</CODE></A></TD><TD valign=top><A HREF="history.html#SEC15">2.3.6 Managing the History File</A></TD></TR> 2003: <TR><TD COLSPAN=3> <HR></TD></TR> 2004: <TR><TH><A NAME="vr_C"></A>C</TH><TD></TD><TD></TD></TR> 2005: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX10"><CODE>clear_history</CODE></A></TD><TD valign=top><A HREF="history.html#SEC11">2.3.2 History List Management</A></TD></TR> 2006: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX16"><CODE>current_history</CODE></A></TD><TD valign=top><A HREF="history.html#SEC12">2.3.3 Information About the History List</A></TD></TR> 2007: <TR><TD COLSPAN=3> <HR></TD></TR> 2008: <TR><TH><A NAME="vr_F"></A>F</TH><TD></TD><TD></TD></TR> 2009: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX8"><CODE>free_history_entry</CODE></A></TD><TD valign=top><A HREF="history.html#SEC11">2.3.2 History List Management</A></TD></TR> 2010: <TR><TD COLSPAN=3> <HR></TD></TR> 2011: <TR><TH><A NAME="vr_G"></A>G</TH><TD></TD><TD></TD></TR> 2012: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX33"><CODE>get_history_event</CODE></A></TD><TD valign=top><A HREF="history.html#SEC16">2.3.7 History Expansion</A></TD></TR> 2013: <TR><TD COLSPAN=3> <HR></TD></TR> 2014: <TR><TH><A NAME="vr_H"></A>H</TH><TD></TD><TD></TD></TR> 2015: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX35"><CODE>history_arg_extract</CODE></A></TD><TD valign=top><A HREF="history.html#SEC16">2.3.7 History Expansion</A></TD></TR> 2016: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX36"><CODE>history_base</CODE></A></TD><TD valign=top><A HREF="history.html#SEC17">2.4 History Variables</A></TD></TR> 2017: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX42"><CODE>history_comment_char</CODE></A></TD><TD valign=top><A HREF="history.html#SEC17">2.4 History Variables</A></TD></TR> 2018: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX32"><CODE>history_expand</CODE></A></TD><TD valign=top><A HREF="history.html#SEC16">2.3.7 History Expansion</A></TD></TR> 2019: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX40"><CODE>history_expansion_char</CODE></A></TD><TD valign=top><A HREF="history.html#SEC17">2.4 History Variables</A></TD></TR> 2020: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX17"><CODE>history_get</CODE></A></TD><TD valign=top><A HREF="history.html#SEC12">2.3.3 Information About the History List</A></TD></TR> 2021: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX3"><CODE>history_get_history_state</CODE></A></TD><TD valign=top><A HREF="history.html#SEC10">2.3.1 Initializing History and State Management</A></TD></TR> 2022: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX18"><CODE>history_get_time</CODE></A></TD><TD valign=top><A HREF="history.html#SEC12">2.3.3 Information About the History List</A></TD></TR> 2023: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX48"><CODE>history_inhibit_expansion_function</CODE></A></TD><TD valign=top><A HREF="history.html#SEC17">2.4 History Variables</A></TD></TR> 2024: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX13"><CODE>history_is_stifled</CODE></A></TD><TD valign=top><A HREF="history.html#SEC11">2.3.2 History List Management</A></TD></TR> 2025: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX37"><CODE>history_length</CODE></A></TD><TD valign=top><A HREF="history.html#SEC17">2.4 History Variables</A></TD></TR> 2026: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX14"><CODE>history_list</CODE></A></TD><TD valign=top><A HREF="history.html#SEC12">2.3.3 Information About the History List</A></TD></TR> 2027: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX38"><CODE>history_max_entries</CODE></A></TD><TD valign=top><A HREF="history.html#SEC17">2.4 History Variables</A></TD></TR> 2028: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX45"><CODE>history_no_expand_chars</CODE></A></TD><TD valign=top><A HREF="history.html#SEC17">2.4 History Variables</A></TD></TR> 2029: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX46"><CODE>history_quotes_inhibit_expansion</CODE></A></TD><TD valign=top><A HREF="history.html#SEC17">2.4 History Variables</A></TD></TR> 2030: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX47"><CODE>history_quoting_state</CODE></A></TD><TD valign=top><A HREF="history.html#SEC17">2.4 History Variables</A></TD></TR> 2031: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX24"><CODE>history_search</CODE></A></TD><TD valign=top><A HREF="history.html#SEC14">2.3.5 Searching the History List</A></TD></TR> 2032: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX44"><CODE>history_search_delimiter_chars</CODE></A></TD><TD valign=top><A HREF="history.html#SEC17">2.4 History Variables</A></TD></TR> 2033: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX26"><CODE>history_search_pos</CODE></A></TD><TD valign=top><A HREF="history.html#SEC14">2.3.5 Searching the History List</A></TD></TR> 2034: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX25"><CODE>history_search_prefix</CODE></A></TD><TD valign=top><A HREF="history.html#SEC14">2.3.5 Searching the History List</A></TD></TR> 2035: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX4"><CODE>history_set_history_state</CODE></A></TD><TD valign=top><A HREF="history.html#SEC10">2.3.1 Initializing History and State Management</A></TD></TR> 2036: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX20"><CODE>history_set_pos</CODE></A></TD><TD valign=top><A HREF="history.html#SEC13">2.3.4 Moving Around the History List</A></TD></TR> 2037: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX41"><CODE>history_subst_char</CODE></A></TD><TD valign=top><A HREF="history.html#SEC17">2.4 History Variables</A></TD></TR> 2038: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX34"><CODE>history_tokenize</CODE></A></TD><TD valign=top><A HREF="history.html#SEC16">2.3.7 History Expansion</A></TD></TR> 2039: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX19"><CODE>history_total_bytes</CODE></A></TD><TD valign=top><A HREF="history.html#SEC12">2.3.3 Information About the History List</A></TD></TR> 2040: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX31"><CODE>history_truncate_file</CODE></A></TD><TD valign=top><A HREF="history.html#SEC15">2.3.6 Managing the History File</A></TD></TR> 2041: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX43"><CODE>history_word_delimiters</CODE></A></TD><TD valign=top><A HREF="history.html#SEC17">2.4 History Variables</A></TD></TR> 2042: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX39"><CODE>history_write_timestamps</CODE></A></TD><TD valign=top><A HREF="history.html#SEC17">2.4 History Variables</A></TD></TR> 2043: <TR><TD COLSPAN=3> <HR></TD></TR> 2044: <TR><TH><A NAME="vr_N"></A>N</TH><TD></TD><TD></TD></TR> 2045: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX22"><CODE>next_history</CODE></A></TD><TD valign=top><A HREF="history.html#SEC13">2.3.4 Moving Around the History List</A></TD></TR> 2046: <TR><TD COLSPAN=3> <HR></TD></TR> 2047: <TR><TH><A NAME="vr_P"></A>P</TH><TD></TD><TD></TD></TR> 2048: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX21"><CODE>previous_history</CODE></A></TD><TD valign=top><A HREF="history.html#SEC13">2.3.4 Moving Around the History List</A></TD></TR> 2049: <TR><TD COLSPAN=3> <HR></TD></TR> 2050: <TR><TH><A NAME="vr_R"></A>R</TH><TD></TD><TD></TD></TR> 2051: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX27"><CODE>read_history</CODE></A></TD><TD valign=top><A HREF="history.html#SEC15">2.3.6 Managing the History File</A></TD></TR> 2052: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX28"><CODE>read_history_range</CODE></A></TD><TD valign=top><A HREF="history.html#SEC15">2.3.6 Managing the History File</A></TD></TR> 2053: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX7"><CODE>remove_history</CODE></A></TD><TD valign=top><A HREF="history.html#SEC11">2.3.2 History List Management</A></TD></TR> 2054: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX9"><CODE>replace_history_entry</CODE></A></TD><TD valign=top><A HREF="history.html#SEC11">2.3.2 History List Management</A></TD></TR> 2055: <TR><TD COLSPAN=3> <HR></TD></TR> 2056: <TR><TH><A NAME="vr_S"></A>S</TH><TD></TD><TD></TD></TR> 2057: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX11"><CODE>stifle_history</CODE></A></TD><TD valign=top><A HREF="history.html#SEC11">2.3.2 History List Management</A></TD></TR> 2058: <TR><TD COLSPAN=3> <HR></TD></TR> 2059: <TR><TH><A NAME="vr_U"></A>U</TH><TD></TD><TD></TD></TR> 2060: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX12"><CODE>unstifle_history</CODE></A></TD><TD valign=top><A HREF="history.html#SEC11">2.3.2 History List Management</A></TD></TR> 2061: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX2"><CODE>using_history</CODE></A></TD><TD valign=top><A HREF="history.html#SEC10">2.3.1 Initializing History and State Management</A></TD></TR> 2062: <TR><TD COLSPAN=3> <HR></TD></TR> 2063: <TR><TH><A NAME="vr_W"></A>W</TH><TD></TD><TD></TD></TR> 2064: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX15"><CODE>where_history</CODE></A></TD><TD valign=top><A HREF="history.html#SEC12">2.3.3 Information About the History List</A></TD></TR> 2065: <TR><TD></TD><TD valign=top><A HREF="history.html#IDX29"><CODE>write_history</CODE></A></TD><TD valign=top><A HREF="history.html#SEC15">2.3.6 Managing the History File</A></TD></TR> 2066: <TR><TD COLSPAN=3> <HR></TD></TR> 2067: </TABLE><table><tr><th valign=top>Jump to:   </th><td><A HREF="history.html#vr_A" style="text-decoration:none">A</A> 2068:   2069: <A HREF="history.html#vr_C" style="text-decoration:none">C</A> 2070:   2071: <A HREF="history.html#vr_F" style="text-decoration:none">F</A> 2072:   2073: <A HREF="history.html#vr_G" style="text-decoration:none">G</A> 2074:   2075: <A HREF="history.html#vr_H" style="text-decoration:none">H</A> 2076:   2077: <A HREF="history.html#vr_N" style="text-decoration:none">N</A> 2078:   2079: <A HREF="history.html#vr_P" style="text-decoration:none">P</A> 2080:   2081: <A HREF="history.html#vr_R" style="text-decoration:none">R</A> 2082:   2083: <A HREF="history.html#vr_S" style="text-decoration:none">S</A> 2084:   2085: <A HREF="history.html#vr_U" style="text-decoration:none">U</A> 2086:   2087: <A HREF="history.html#vr_W" style="text-decoration:none">W</A> 2088:   2089: </td></tr></table>  2090: 2091: <HR SIZE="6"> 2092: <A NAME="SEC_Contents"></A> 2093: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 2094: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 2095: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 2096: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 2097: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 2098: </TR></TABLE> 2099: <H1>Table of Contents</H1> 2100: <UL> 2101: <A NAME="TOC1" HREF="history.html#SEC1">1. Using History Interactively</A> 2102:   2103: <UL> 2104: <A NAME="TOC2" HREF="history.html#SEC2">1.1 History Expansion</A> 2105:   2106: <UL> 2107: <A NAME="TOC3" HREF="history.html#SEC3">1.1.1 Event Designators</A> 2108:   2109: <A NAME="TOC4" HREF="history.html#SEC4">1.1.2 Word Designators</A> 2110:   2111: <A NAME="TOC5" HREF="history.html#SEC5">1.1.3 Modifiers</A> 2112:   2113: </UL> 2114: </UL> 2115: <A NAME="TOC6" HREF="history.html#SEC6">2. Programming with GNU History</A> 2116:   2117: <UL> 2118: <A NAME="TOC7" HREF="history.html#SEC7">2.1 Introduction to History</A> 2119:   2120: <A NAME="TOC8" HREF="history.html#SEC8">2.2 History Storage</A> 2121:   2122: <A NAME="TOC9" HREF="history.html#SEC9">2.3 History Functions</A> 2123:   2124: <UL> 2125: <A NAME="TOC10" HREF="history.html#SEC10">2.3.1 Initializing History and State Management</A> 2126:   2127: <A NAME="TOC11" HREF="history.html#SEC11">2.3.2 History List Management</A> 2128:   2129: <A NAME="TOC12" HREF="history.html#SEC12">2.3.3 Information About the History List</A> 2130:   2131: <A NAME="TOC13" HREF="history.html#SEC13">2.3.4 Moving Around the History List</A> 2132:   2133: <A NAME="TOC14" HREF="history.html#SEC14">2.3.5 Searching the History List</A> 2134:   2135: <A NAME="TOC15" HREF="history.html#SEC15">2.3.6 Managing the History File</A> 2136:   2137: <A NAME="TOC16" HREF="history.html#SEC16">2.3.7 History Expansion</A> 2138:   2139: </UL> 2140: <A NAME="TOC17" HREF="history.html#SEC17">2.4 History Variables</A> 2141:   2142: <A NAME="TOC18" HREF="history.html#SEC18">2.5 History Programming Example</A> 2143:   2144: </UL> 2145: <A NAME="TOC19" HREF="history.html#SEC19">A. GNU Free Documentation License</A> 2146:   2147: <A NAME="TOC21" HREF="history.html#SEC21">B. Concept Index</A> 2148:   2149: <A NAME="TOC22" HREF="history.html#SEC22">C. Function and Variable Index</A> 2150:   2151: </UL> 2152: <HR SIZE=1> 2153: <A NAME="SEC_OVERVIEW"></A> 2154: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 2155: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 2156: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 2157: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 2158: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 2159: </TR></TABLE> 2160: <H1>Short Table of Contents</H1> 2161: <BLOCKQUOTE> 2162: <A NAME="TOC1" HREF="history.html#SEC1">1. Using History Interactively</A> 2163:   2164: <A NAME="TOC6" HREF="history.html#SEC6">2. Programming with GNU History</A> 2165:   2166: <A NAME="TOC19" HREF="history.html#SEC19">A. GNU Free Documentation License</A> 2167:   2168: <A NAME="TOC21" HREF="history.html#SEC21">B. Concept Index</A> 2169:   2170: <A NAME="TOC22" HREF="history.html#SEC22">C. Function and Variable Index</A> 2171:   2172: 2173: </BLOCKQUOTE> 2174: <HR SIZE=1> 2175: <A NAME="SEC_About"></A> 2176: <TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0> 2177: <TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Top">Top</A>]</TD> 2178: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_Contents">Contents</A>]</TD> 2179: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC21">Index</A>]</TD> 2180: <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="history.html#SEC_About"> ? </A>]</TD> 2181: </TR></TABLE> 2182: <H1>About this document</H1> 2183: This document was generated by Chet Ramey on October, 30 2020 2184: using <A HREF="http://www.mathematik.uni-kl.de/~obachman/Texi2html 2185: ">texi2html</A> 2186:  2187: The buttons in the navigation panels have the following meaning: 2188:  2189: <table border = "1"> 2190: <TR> 2191: <TH> Button </TH> 2192: <TH> Name </TH> 2193: <TH> Go to </TH> 2194: <TH> From 1.2.3 go to</TH> 2195: </TR> 2196: <TR> 2197: <TD ALIGN="CENTER"> 2198: [ < ] </TD> 2199: <TD ALIGN="CENTER"> 2200: Back 2201: </TD> 2202: <TD> 2203: previous section in reading order 2204: </TD> 2205: <TD> 2206: 1.2.2 2207: </TD> 2208: </TR> 2209: <TR> 2210: <TD ALIGN="CENTER"> 2211: [ > ] </TD> 2212: <TD ALIGN="CENTER"> 2213: Forward 2214: </TD> 2215: <TD> 2216: next section in reading order 2217: </TD> 2218: <TD> 2219: 1.2.4 2220: </TD> 2221: </TR> 2222: <TR> 2223: <TD ALIGN="CENTER"> 2224: [ << ] </TD> 2225: <TD ALIGN="CENTER"> 2226: FastBack 2227: </TD> 2228: <TD> 2229: previous or up-and-previous section 2230: </TD> 2231: <TD> 2232: 1.1 2233: </TD> 2234: </TR> 2235: <TR> 2236: <TD ALIGN="CENTER"> 2237: [ Up ] </TD> 2238: <TD ALIGN="CENTER"> 2239: Up 2240: </TD> 2241: <TD> 2242: up section 2243: </TD> 2244: <TD> 2245: 1.2 2246: </TD> 2247: </TR> 2248: <TR> 2249: <TD ALIGN="CENTER"> 2250: [ >> ] </TD> 2251: <TD ALIGN="CENTER"> 2252: FastForward 2253: </TD> 2254: <TD> 2255: next or up-and-next section 2256: </TD> 2257: <TD> 2258: 1.3 2259: </TD> 2260: </TR> 2261: <TR> 2262: <TD ALIGN="CENTER"> 2263: [Top] </TD> 2264: <TD ALIGN="CENTER"> 2265: Top 2266: </TD> 2267: <TD> 2268: cover (top) of document 2269: </TD> 2270: <TD> 2271:   2272: </TD> 2273: </TR> 2274: <TR> 2275: <TD ALIGN="CENTER"> 2276: [Contents] </TD> 2277: <TD ALIGN="CENTER"> 2278: Contents 2279: </TD> 2280: <TD> 2281: table of contents 2282: </TD> 2283: <TD> 2284:   2285: </TD> 2286: </TR> 2287: <TR> 2288: <TD ALIGN="CENTER"> 2289: [Index] </TD> 2290: <TD ALIGN="CENTER"> 2291: Index 2292: </TD> 2293: <TD> 2294: concept index 2295: </TD> 2296: <TD> 2297:   2298: </TD> 2299: </TR> 2300: <TR> 2301: <TD ALIGN="CENTER"> 2302: [ ? ] </TD> 2303: <TD ALIGN="CENTER"> 2304: About 2305: </TD> 2306: <TD> 2307: this page 2308: </TD> 2309: <TD> 2310:   2311: </TD> 2312: </TR> 2313: </TABLE> 2314:  2315: where the  Example  assumes that the current position 2316: is at  Subsubsection One-Two-Three  of a document of 2317: the following structure: 2318: <UL> 2319: <LI> 1. 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