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G(nts are relati).15 E .3 -.15(ve t)-.25 H 2.5(ot).15 G
(he current position in the history list.)-2.5 E F2(!)108 429.6 Q F0
(Start a history substitution, e)144 429.6 Q(xcept when follo)-.15 E
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(ve)-.25 G(nt speci\214cation, the pre).15 E
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(Modi\214ers)87 213.6 Q F0 .183(After the optional w)108 225.6 R .183
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(here may appear a sequence of one or more of the follo)-2.683 F .184
(wing modi\214ers,)-.25 F(each preceded by a `:'.)108 237.6 Q
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(t)108 266.4 Q F0(Remo)144 266.4 Q .3 -.15(ve a)-.15 H
(ll leading \214le name components, lea).15 E(ving the tail.)-.2 E F1(r)
108 278.4 Q F0(Remo)144 278.4 Q .3 -.15(ve a t)-.15 H(railing suf).15 E
(\214x of the form)-.25 E F2(.xxx)2.5 E F0 2.5(,l)C(ea)-2.5 E
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302.4 Q F0(Print the ne)144 302.4 Q 2.5(wc)-.25 G(ommand b)-2.5 E
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(Quote the substituted w)144 314.4 Q
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(Quote the substituted w)144 326.4 R .386(ords as with)-.1 F F1(q)2.886
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108 434.4 Q F0(Repeat the pre)144 434.4 Q(vious substitution.)-.25 E F1
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-.15(ve)-.25 G(nt line.).15 E(An)5 E F1(a)2.5 E F0
(may be used as a synon)2.5 E(ym for)-.15 E F1(g)2.5 E F0(.)A F1(G)108
482.4 Q F0(Apply the follo)144 482.4 Q(wing `)-.25 E F1(s)A F0 2.5('o)C
2.5(r`)-2.5 G F1(&)-2.5 E F0 2.5('m)C(odi\214er once to each w)-2.5 E
(ord in the e)-.1 E -.15(ve)-.25 G(nt line.).15 E/F3 10.95/Times-Bold@0
SF(PR)72 499.2 Q(OGRAMMING WITH HIST)-.329 E(OR)-.197 E 2.738(YF)-.383 G
(UNCTIONS)-2.738 E F0(This section describes ho)108 511.2 Q 2.5(wt)-.25
G 2.5(ou)-2.5 G(se the History library in other programs.)-2.5 E F1
(Intr)87 528 Q(oduction to History)-.18 E F0 2.883(Ap)108 540 S .383
(rogrammer using the History library has a)-2.883 F -.25(va)-.2 G .382
(ilable functions for remembering lines on a history list, as-).25 F .77
(sociating arbitrary data with a line, remo)108 552 R .771
(ving lines from the list, searching through the list for a line con-)
-.15 F .303(taining an arbitrary te)108 564 R .303
(xt string, and referencing an)-.15 F 2.803(yl)-.15 G .303
(ine in the list directly)-2.803 F 5.303(.I)-.65 G 2.803(na)-5.303 G
.303(ddition, a history)-2.803 F F2 -.2(ex)2.802 G(pansion).2 E F0
(function is a)108 576 Q -.25(va)-.2 G(ilable which pro).25 E
(vides for a consistent user interf)-.15 E(ace across dif)-.1 E
(ferent programs.)-.25 E .059(The user using programs written with the \
History library has the bene\214t of a consistent user interf)108 592.8
R .059(ace with a)-.1 F .918(set of well-kno)108 604.8 R .917
(wn commands for manipulating the te)-.25 F .917(xt of pre)-.15 F .917
(vious lines and using that te)-.25 F .917(xt in ne)-.15 F 3.417(wc)-.25
G(om-)-3.417 E 4.183(mands. The)108 616.8 R 1.684(basic history manipul\
ation commands are identical to the history substitution pro)4.183 F
1.684(vided by)-.15 F F1(bash)108 628.8 Q F0(.)A .915
(The programmer can also use the Readline library)108 645.6 R 3.415(,w)
-.65 G .915(hich includes some history manipulation by def)-3.415 F
(ault,)-.1 E(and has the added adv)108 657.6 Q
(antage of command line editing.)-.25 E .39(Before declaring an)108
674.4 R 2.89(yf)-.15 G .39(unctions using an)-2.89 F 2.89(yf)-.15 G .39
(unctionality the History library pro)-2.89 F .39
(vides in other code, an appli-)-.15 F .067
(cation writer should include the \214le)108 686.4 R F2(<r)4.233 E
(eadline/history)-.37 E(.h>)-.55 E F0 .067(in an)4.233 F 2.566<798c>-.15
G .066(le that uses the History library')-2.566 F 2.566(sf)-.55 G
(eatures.)-2.566 E .538(It supplies e)108 698.4 R .538
(xtern declarations for all of the library')-.15 F 3.038(sp)-.55 G .538
(ublic functions and v)-3.038 F .539(ariables, and declares all of the)
-.25 F(public data structures.)108 710.4 Q(GNU History 8.1)72 768 Q
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/F0 10/Times-Roman@0 SF(HIST)72 48 Q(OR)-.18 E 124.845(Y\(3\) Library)
-.65 F(Functions Manual)2.5 E(HIST)127.345 E(OR)-.18 E(Y\(3\))-.65 E/F1
10/Times-Bold@0 SF(History Storage)87 84 Q F0
(The history list is an array of history entries.)108 96 Q 2.5(Ah)5 G
(istory entry is declared as follo)-2.5 E(ws:)-.25 E/F2 10
/Times-Italic@0 SF(typedef void *)108 112.8 Q F1(histdata_t;)2.5 E F0
(typedef struct _hist_entry {)108 129.6 Q(char *line;)113 141.6 Q
(char *timestamp;)113 153.6 Q(histdata_t data;)113 165.6 Q 2.5(}H)108
177.6 S(IST_ENTR)-2.5 E -.92(Y;)-.65 G
(The history list itself might therefore be declared as)108 194.4 Q F2
(HIST_ENTR)108 211.2 Q 2.5(Y*)-.18 G(*)-2.5 E F1(the_history_list;)2.5 E
F0(The state of the History library is encapsulated into a single struc\
ture:)108 228 Q(/*)108 244.8 Q 2.5(*As)110.5 256.8 S
(tructure used to pass around the current state of the history)-2.5 E(.)
-.65 E(*/)110.5 268.8 Q(typedef struct _hist_state {)108 280.8 Q
(HIST_ENTR)113 292.8 Q 2.5(Y*)-.65 G
(*entries; /* Pointer to the entries themselv)-2.5 E(es. */)-.15 E
(int of)113 304.8 Q 25(fset; /*)-.25 F
(The location pointer within this array)2.5 E 2.5(.*)-.65 G(/)-2.5 E
(int length;)113 316.8 Q(/* Number of elements within this array)27.5 E
2.5(.*)-.65 G(/)-2.5 E(int size;)113 328.8 Q
(/* Number of slots allocated to this array)32.5 E 2.5(.*)-.65 G(/)-2.5
E(int \215ags;)113 340.8 Q 2.5(}H)108 352.8 S(IST)-2.5 E(OR)-.18 E(Y_ST)
-.65 E -1.11(AT)-.93 G(E;)1.11 E(If the \215ags member includes)108
369.6 Q F1(HS_STIFLED)2.5 E F0 2.5(,t)C(he history has been sti\215ed.)
-2.5 E/F3 10.95/Times-Bold@0 SF(History Functions)72 386.4 Q F0
(This section describes the calling sequence for the v)108 398.4 Q
(arious functions e)-.25 E(xported by the GNU History library)-.15 E(.)
-.65 E F1(Initializing History and State Management)87 415.2 Q F0 1.274
(This section describes functions used to initialize and manage the sta\
te of the History library when you)108 427.2 R -.1(wa)108 439.2 S
(nt to use the history functions in your program.).1 E F2(void)108 463.2
Q F1(using_history)2.5 E F0(\()4.166 E F2(void)A F0(\))1.666 E(Be)108
475.2 Q(gin a session in which the history functions might be used.)-.15
E(This initializes the interacti)5 E .3 -.15(ve v)-.25 H(ariables.)-.1 E
F2(HIST)108 499.2 Q(OR)-.18 E(Y_ST)-.18 E -.37(AT)-.5 G 2.5(E*).37 G F1
(history_get_history_state)A F0(\()4.166 E F2(void)A F0(\))1.666 E
(Return a structure describing the current state of the input history)
108 511.2 Q(.)-.65 E F2(void)108 535.2 Q F1(history_set_history_state)
2.5 E F0(\()4.166 E F2(HIST)A(OR)-.18 E(Y_ST)-.18 E -.37(AT)-.5 G 2.5
(E*).37 G(state)-2.5 E F0(\))1.666 E
(Set the state of the history list according to)108 547.2 Q F2(state)2.5
E F0(.)A F1(History List Management)87 576 Q F0
(These functions manage indi)108 588 Q(vidual entries on the history li\
st, or set parameters managing the list itself.)-.25 E F2(void)108 612 Q
F1(add_history)2.5 E F0(\()4.166 E F2(const c)A(har *string)-.15 E F0
(\))1.666 E(Place)108 624 Q F2(string)3.279 E F0 .779
(at the end of the history list.)3.279 F .779
(The associated data \214eld \(if an)5.779 F .779(y\) is set to)-.15 F
F1(NULL)3.279 E F0 5.779(.I)C 3.279(ft)-5.779 G .78(he maxi-)-3.279 F
.787(mum number of history entries has been set using)108 636 R F1
(sti\215e_history\(\))3.286 E F0 3.286(,a)C .786(nd the ne)-3.286 F
3.286(wn)-.25 G .786(umber of history entries)-3.286 F -.1(wo)108 648 S
(uld e).1 E(xceed that maximum, the oldest history entry is remo)-.15 E
-.15(ve)-.15 G(d.).15 E F2(void)108 672 Q F1(add_history_time)2.5 E F0
(\()4.166 E F2(const c)A(har *string)-.15 E F0(\))1.666 E
(Change the time stamp associated with the most recent history entry to)
108 684 Q F2(string)2.5 E F0(.)A F2(HIST_ENTR)108 708 Q 2.5(Y*)-.18 G F1
-.18(re)C(mo).18 E -.1(ve)-.1 G(_history).1 E F0(\()4.166 E F2(int whic)
A(h)-.15 E F0(\))1.666 E(Remo)108 720 Q .352 -.15(ve h)-.15 H .052
(istory entry at of).15 F(fset)-.25 E F2(whic)2.553 E(h)-.15 E F0 .053
(from the history)2.553 F 5.053(.T)-.65 G .053(he remo)-5.053 F -.15(ve)
-.15 G 2.553(de).15 G .053(lement is returned so you can free the)-2.553
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/F0 10/Times-Roman@0 SF(HIST)72 48 Q(OR)-.18 E 124.845(Y\(3\) Library)
-.65 F(Functions Manual)2.5 E(HIST)127.345 E(OR)-.18 E(Y\(3\))-.65 E
(line, data, and containing structure.)108 84 Q/F1 10/Times-Italic@0 SF
(histdata_t)108 108 Q/F2 10/Times-Bold@0 SF(fr)2.5 E(ee_history_entry)
-.18 E F0(\()4.166 E F1(HIST_ENTR)A 2.5(Y*)-.18 G(histent)-2.5 E F0(\))
1.666 E .934(Free the history entry)108 120 R F1(histent)3.433 E F0 .933
(and an)3.433 F 3.433(yh)-.15 G .933(istory library pri)-3.433 F -.25
(va)-.25 G .933(te data associated with it.).25 F .933
(Returns the applica-)5.933 F
(tion-speci\214c data so the caller can dispose of it.)108 132 Q F1
(HIST_ENTR)108 156 Q 2.5(Y*)-.18 G F2 -.18(re)C(place_history_entry).18
E F0(\()4.166 E F1(int whic)A -.834(h, const)-.15 F -.15(ch)2.5 G
(ar *line).15 E 1.666(,h)-.1 G(istdata_t data)-1.666 E F0(\))3.332 E
(Mak)108 168 Q 3.062(et)-.1 G .562(he history entry at of)-3.062 F(fset)
-.25 E F1(whic)3.062 E(h)-.15 E F0(ha)3.062 E -.15(ve)-.2 G F1(line)
3.212 E F0(and)3.062 E F1(data)3.062 E F0 5.563(.T)C .563
(his returns the old entry so the caller can dis-)-5.563 F(pose of an)
108 180 Q 2.5(ya)-.15 G(pplication-speci\214c data.)-2.5 E
(In the case of an in)5 E -.25(va)-.4 G(lid).25 E F1(whic)2.5 E(h)-.15 E
F0 2.5(,a)C F2(NULL)A F0(pointer is returned.)2.5 E F1(void)108 204 Q F2
(clear_history)2.5 E F0(\()4.166 E F1(void)A F0(\))1.666 E
(Clear the history list by deleting all the entries.)108 216 Q F1(void)
108 240 Q F2(sti\215e_history)2.5 E F0(\()4.166 E F1(int max)A F0(\))
1.666 E .38(Sti\215e the history list, remembering only the last)108 252
R F1(max)2.88 E F0 2.88(entries. The)2.88 F .38
(history list will contain only)2.88 F F1(max)2.88 E F0(entries)2.88 E
(at a time.)108 264 Q F1(int)108 288 Q F2(unsti\215e_history)2.5 E F0
(\()4.166 E F1(void)A F0(\))1.666 E .46(Stop sti\215ing the history)108
300 R 5.46(.T)-.65 G .46(his returns the pre)-5.46 F .46
(viously-set maximum number of history entries \(as set by)-.25 F F2
(sti-)2.96 E(\215e_history\(\))108 312 Q F0 2.5(\). history)B -.1(wa)2.5
G 2.5(ss).1 G 2.5(ti\215ed. The)-2.5 F -.25(va)2.5 G(lue is positi).25 E
.3 -.15(ve i)-.25 H 2.5(ft).15 G(he history w)-2.5 E(as sti\215ed, ne)
-.1 E -.05(ga)-.15 G(ti).05 E .3 -.15(ve i)-.25 H 2.5(fi).15 G 2.5(tw)
-2.5 G(asn')-2.6 E(t.)-.18 E F1(int)108 336 Q F2(history_is_sti\215ed)
2.5 E F0(\()4.166 E F1(void)A F0(\))1.666 E
(Returns non-zero if the history is sti\215ed, zero if it is not.)108
348 Q F2(Inf)87 376.8 Q(ormation About the History List)-.25 E F0(These\
 functions return information about the entire history list or indi)108
388.8 Q(vidual list entries.)-.25 E F1(HIST_ENTR)108 412.8 Q 2.5(Y*)-.18
G(*)-2.5 E F2(history_list)2.5 E F0(\()4.166 E F1(void)A F0(\))1.666 E
.708(Return a)108 424.8 R F2(NULL)3.208 E F0 .708(terminated array of)
3.208 F F1(HIST_ENTR)3.208 E 3.208(Y*)-.18 G F0 .708
(which is the current input history)B 5.707(.E)-.65 G .707
(lement 0 of this)-5.707 F(list is the be)108 436.8 Q(ginning of time.)
-.15 E(If there is no history)5 E 2.5(,r)-.65 G(eturn)-2.5 E F2(NULL)2.5
E F0(.)A F1(int)108 460.8 Q F2(wher)2.5 E(e_history)-.18 E F0(\()4.166 E
F1(void)A F0(\))1.666 E(Returns the of)108 472.8 Q
(fset of the current history element.)-.25 E F1(HIST_ENTR)108 496.8 Q
2.5(Y*)-.18 G F2(curr)A(ent_history)-.18 E F0(\()4.166 E F1(void)A F0
(\))1.666 E 1.373
(Return the history entry at the current position, as determined by)108
508.8 R F2(wher)3.873 E(e_history\(\))-.18 E F0 6.373(.I)C 3.873(ft)
-6.373 G 1.374(here is no entry)-3.873 F(there, return a)108 520.8 Q F2
(NULL)2.5 E F0(pointer)2.5 E(.)-.55 E F1(HIST_ENTR)108 544.8 Q 2.5(Y*)
-.18 G F2(history_get)A F0(\()4.166 E F1(int of)A(fset)-.18 E F0(\))
1.666 E 1.069(Return the history entry at position)108 556.8 R F1(of)
3.569 E(fset)-.18 E F0 6.069(.T)C 1.069(he range of v)-6.069 F 1.069
(alid v)-.25 F 1.069(alues of)-.25 F F1(of)3.569 E(fset)-.18 E F0 1.068
(starts at)3.569 F F2(history_base)3.568 E F0(and)3.568 E .286(ends at)
108 568.8 R F2(history_length)2.786 E F0 2.786<ad31>2.786 G 5.286(.I)
-2.786 G 2.786(ft)-5.286 G .286(here is no entry there, or if)-2.786 F
F1(of)2.786 E(fset)-.18 E F0 .286(is outside the v)2.786 F .287
(alid range, return a)-.25 F F2(NULL)2.787 E F0(pointer)108 580.8 Q(.)
-.55 E F1(time_t)108 604.8 Q F2(history_get_time)2.5 E F0(\()4.166 E F1
(HIST_ENTR)A 2.5(Y*)-.18 G F0(\))-.834 E(Return the time stamp associat\
ed with the history entry passed as the ar)108 616.8 Q(gument.)-.18 E F1
(int)108 640.8 Q F2(history_total_bytes)2.5 E F0(\()4.166 E F1(void)A F0
(\))1.666 E .392
(Return the number of bytes that the primary history entries are using.)
108 652.8 R .391(This function returns the sum of the)5.392 F
(lengths of all the lines in the history)108 664.8 Q(.)-.65 E F2(Mo)87
693.6 Q(ving Ar)-.1 E(ound the History List)-.18 E F0
(These functions allo)108 705.6 Q 2.5(wt)-.25 G(he current inde)-2.5 E
2.5(xi)-.15 G(nto the history list to be set or changed.)-2.5 E F1(int)
108 729.6 Q F2(history_set_pos)2.5 E F0(\()4.166 E F1(int pos)A F0(\))
1.666 E(GNU History 8.1)72 768 Q(2020 July 17)139.005 E(4)203.165 E 0 Cg
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/F0 10/Times-Roman@0 SF(HIST)72 48 Q(OR)-.18 E 124.845(Y\(3\) Library)
-.65 F(Functions Manual)2.5 E(HIST)127.345 E(OR)-.18 E(Y\(3\))-.65 E .79
(Set the current history of)108 84 R .79(fset to)-.25 F/F1 10
/Times-Italic@0 SF(pos)3.29 E F0 3.29(,a)C 3.29(na)-3.29 G .79
(bsolute inde)-3.29 F 3.29(xi)-.15 G .79(nto the list.)-3.29 F .79
(Returns 1 on success, 0 if)5.79 F F1(pos)3.29 E F0 .79(is less)3.29 F
(than zero or greater than the number of history entries.)108 96 Q F1
(HIST_ENTR)108 120 Q 2.5(Y*)-.18 G/F2 10/Times-Bold@0 SF(pr)A -.15(ev)
-.18 G(ious_history).15 E F0(\()4.166 E F1(void)A F0(\))1.666 E .208
(Back up the current history of)108 132 R .208(fset to the pre)-.25 F
.208(vious history entry)-.25 F 2.707(,a)-.65 G .207
(nd return a pointer to that entry)-2.707 F 5.207(.I)-.65 G 2.707(ft)
-5.207 G .207(here is)-2.707 F(no pre)108 144 Q(vious entry)-.25 E 2.5
(,r)-.65 G(eturn a)-2.5 E F2(NULL)2.5 E F0(pointer)2.5 E(.)-.55 E F1
(HIST_ENTR)108 168 Q 2.5(Y*)-.18 G F2(next_history)A F0(\()4.166 E F1
(void)A F0(\))1.666 E .332(If the current history of)108 180 R .333
(fset refers to a v)-.25 F .333(alid history entry)-.25 F 2.833(,i)-.65
G .333(ncrement the current history of)-2.833 F 2.833(fset. If)-.25 F
.333(the possi-)2.833 F .202(bly-incremented history of)108 192 R .202
(fset refers to a v)-.25 F .202(alid history entry)-.25 F 2.702(,r)-.65
G .202(eturn a pointer to that entry; otherwise, return)-2.702 F(a)108
204 Q F2(NULL)2.5 E F0(pointer)2.5 E(.)-.55 E F2(Sear)87 232.8 Q
(ching the History List)-.18 E F0 .005(These functions allo)108 244.8 R
2.505(ws)-.25 G .006(earching of the history list for entries containin\
g a speci\214c string.)-2.505 F .006(Searching may be)5.006 F 1.452
(performed both forw)108 256.8 R 1.452(ard and backw)-.1 F 1.451
(ard from the current history position.)-.1 F 1.451(The search may be)
6.451 F F1(anc)3.951 E(hor)-.15 E(ed)-.37 E F0(,)A
(meaning that the string must match at the be)108 268.8 Q
(ginning of the history entry)-.15 E(.)-.65 E F1(int)108 292.8 Q F2
(history_sear)2.5 E(ch)-.18 E F0(\()4.166 E F1(const c)A(har *string)
-.15 E 1.666(,i)-.1 G(nt dir)-1.666 E(ection)-.37 E F0(\))1.666 E .155
(Search the history for)108 304.8 R F1(string)2.655 E F0 2.656(,s)C .156
(tarting at the current history of)-2.656 F 2.656(fset. If)-.25 F F1
(dir)2.656 E(ection)-.37 E F0 .156(is less than 0, then the search)2.656
F .802(is through pre)108 316.8 R .802
(vious entries, otherwise through subsequent entries.)-.25 F(If)5.801 E
F1(string)3.301 E F0 .801(is found, then the current his-)3.301 F .064
(tory inde)108 328.8 R 2.564(xi)-.15 G 2.564(ss)-2.564 G .064
(et to that history entry)-2.564 F 2.564(,a)-.65 G .064(nd the v)-2.564
F .064(alue returned is the of)-.25 F .064
(fset in the line of the entry where)-.25 F F1(string)2.565 E F0 -.1(wa)
108 340.8 S 2.5(sf).1 G 2.5(ound. Otherwise,)-2.5 F
(nothing is changed, and a -1 is returned.)2.5 E F1(int)108 364.8 Q F2
(history_sear)2.5 E(ch_pr)-.18 E(e\214x)-.18 E F0(\()4.166 E F1(const c)
A(har *string)-.15 E 1.666(,i)-.1 G(nt dir)-1.666 E(ection)-.37 E F0(\))
1.666 E .684(Search the history for)108 376.8 R F1(string)3.183 E F0
3.183(,s)C .683(tarting at the current history of)-3.183 F 3.183
(fset. The)-.25 F .683(search is anchored: matching lines)3.183 F 1.063
(must be)108 388.8 R 1.063(gin with)-.15 F F1(string)3.563 E F0 6.063
(.I)C(f)-6.063 E F1(dir)3.563 E(ection)-.37 E F0 1.064
(is less than 0, then the search is through pre)3.563 F 1.064
(vious entries, otherwise)-.25 F .34(through subsequent entries.)108
400.8 R(If)5.34 E F1(string)2.84 E F0 .34
(is found, then the current history inde)2.84 F 2.84(xi)-.15 G 2.84(ss)
-2.84 G .34(et to that entry)-2.84 F 2.84(,a)-.65 G .34(nd the re-)-2.84
F(turn v)108 412.8 Q(alue is 0.)-.25 E
(Otherwise, nothing is changed, and a -1 is returned.)5 E F1(int)108
436.8 Q F2(history_sear)2.5 E(ch_pos)-.18 E F0(\()4.166 E F1(const c)A
(har *string)-.15 E 1.666(,i)-.1 G(nt dir)-1.666 E -.834(ection, int)
-.37 F(pos)2.5 E F0(\))3.332 E .603(Search for)108 448.8 R F1(string)
3.103 E F0 .603(in the history list, starting at)3.103 F F1(pos)3.104 E
F0 3.104(,a)C 3.104(na)-3.104 G .604(bsolute inde)-3.104 F 3.104(xi)-.15
G .604(nto the list.)-3.104 F(If)5.604 E F1(dir)3.104 E(ection)-.37 E F0
.604(is ne)3.104 F -.05(ga)-.15 G(ti).05 E -.15(ve)-.25 G(,).15 E .608
(the search proceeds backw)108 460.8 R .608(ard from)-.1 F F1(pos)3.108
E F0 3.108(,o)C .608(therwise forw)-3.108 F 3.108(ard. Returns)-.1 F
.608(the absolute inde)3.108 F 3.108(xo)-.15 G 3.108(ft)-3.108 G .608
(he history ele-)-3.108 F(ment where)108 472.8 Q F1(string)2.5 E F0 -.1
(wa)2.5 G 2.5(sf).1 G(ound, or -1 otherwise.)-2.5 E F2
(Managing the History File)87 501.6 Q F0 .035(The History library can r\
ead the history from and write it to a \214le.)108 513.6 R .036
(This section documents the functions for)5.035 F
(managing a history \214le.)108 525.6 Q F1(int)108 549.6 Q F2 -.18(re)
2.5 G(ad_history).18 E F0(\()4.166 E F1(const c)A(har *\214lename)-.15 E
F0(\))1.666 E .151(Add the contents of)108 561.6 R F1(\214lename)2.651 E
F0 .151(to the history list, a line at a time.)2.651 F(If)5.15 E F1
(\214lename)2.65 E F0(is)2.65 E F2(NULL)2.65 E F0 2.65(,t)C .15
(hen read from)-2.65 F F1(~/.his-)2.65 E(tory)108 573.6 Q F0 5(.R)C
(eturns 0 if successful, or)-5 E F2(err)2.5 E(no)-.15 E F0(if not.)2.5 E
F1(int)108 597.6 Q F2 -.18(re)2.5 G(ad_history_range).18 E F0(\()4.166 E
F1(const c)A(har *\214lename)-.15 E 1.666(,i)-.1 G(nt fr)-1.666 E -.834
(om, int)-.45 F(to)2.5 E F0(\))3.332 E .052(Read a range of lines from)
108 609.6 R F1(\214lename)2.553 E F0 2.553(,a)C .053
(dding them to the history list.)-2.553 F .053(Start reading at line)
5.053 F F1(fr)2.553 E(om)-.45 E F0 .053(and end at)2.553 F F1(to)2.553 E
F0(.)A(If)108 621.6 Q F1(fr)2.889 E(om)-.45 E F0 .389
(is zero, start at the be)2.889 F 2.889(ginning. If)-.15 F F1(to)2.889 E
F0 .389(is less than)2.889 F F1(fr)2.889 E(om)-.45 E F0 2.889(,t)C .388
(hen read until the end of the \214le.)-2.889 F(If)5.388 E F1
(\214lename)2.888 E F0(is)108 633.6 Q F2(NULL)2.5 E F0 2.5(,t)C
(hen read from)-2.5 E F1(~/.history)2.5 E F0 5(.R)C
(eturns 0 if successful, or)-5 E F2(err)2.5 E(no)-.15 E F0(if not.)2.5 E
F1(int)108 657.6 Q F2(write_history)2.5 E F0(\()4.166 E F1(const c)A
(har *\214lename)-.15 E F0(\))1.666 E .961(Write the current history to)
108 669.6 R F1(\214lename)3.461 E F0 3.461(,o)C -.15(ve)-3.611 G
(rwriting).15 E F1(\214lename)3.461 E F0 .961(if necessary)3.461 F 5.961
(.I)-.65 G(f)-5.961 E F1(\214lename)3.462 E F0(is)3.462 E F2(NULL)3.462
E F0 3.462(,t)C .962(hen write)-3.462 F(the history list to)108 681.6 Q
F1(~/.history)2.5 E F0 5(.R)C(eturns 0 on success, or)-5 E F2(err)2.5 E
(no)-.15 E F0(on a read or write error)2.5 E(.)-.55 E F1(int)108 717.6 Q
F2(append_history)2.5 E F0(\()4.166 E F1(int nelements,)A(const c)1.666
E(har *\214lename)-.15 E F0(\))1.666 E .839(Append the last)108 729.6 R
F1(nelements)3.339 E F0 .839(of the history list to)3.339 F F1
(\214lename)3.339 E F0 5.839(.I)C(f)-5.839 E F1(\214lename)3.339 E F0
(is)3.339 E F2(NULL)3.339 E F0 3.339(,t)C .838(hen append to)-3.339 F F1
(~/.history)3.338 E F0(.)A(GNU History 8.1)72 768 Q(2020 July 17)139.005
E(5)203.165 E 0 Cg EP
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/F0 10/Times-Roman@0 SF(HIST)72 48 Q(OR)-.18 E 124.845(Y\(3\) Library)
-.65 F(Functions Manual)2.5 E(HIST)127.345 E(OR)-.18 E(Y\(3\))-.65 E
(Returns 0 on success, or)108 84 Q/F1 10/Times-Bold@0 SF(err)2.5 E(no)
-.15 E F0(on a read or write error)2.5 E(.)-.55 E/F2 10/Times-Italic@0
SF(int)108 108 Q F1(history_truncate_\214le)2.5 E F0(\()4.166 E F2
(const c)A(har *\214lename)-.15 E 1.666(,i)-.1 G(nt nlines)-1.666 E F0
(\))1.666 E -.35(Tr)108 120 S .38(uncate the history \214le).35 F F2
(\214lename)2.88 E F0 2.88(,l)C(ea)-2.88 E .38(ving only the last)-.2 F
F2(nlines)2.881 E F0 2.881(lines. If)2.881 F F2(\214lename)2.881 E F0
(is)2.881 E F1(NULL)2.881 E F0 2.881(,t)C(hen)-2.881 E F2(~/.history)
2.881 E F0(is)2.881 E 2.5(truncated. Returns)108 132 R 2.5(0o)2.5 G 2.5
(ns)-2.5 G(uccess, or)-2.5 E F1(err)2.5 E(no)-.15 E F0(on f)2.5 E
(ailure.)-.1 E F1(History Expansion)87 160.8 Q F0
(These functions implement history e)108 172.8 Q(xpansion.)-.15 E F2
(int)108 196.8 Q F1(history_expand)2.5 E F0(\()4.166 E F2 -.15(ch)C
(ar *string).15 E 1.666(,c)-.1 G(har **output)-1.816 E F0(\))1.666 E
(Expand)108 208.8 Q F2(string)2.5 E F0 2.5(,p)C(lacing the result into)
-2.5 E F2(output)2.5 E F0 2.5(,ap)C(ointer to a string.)-2.5 E(Returns:)
5 E(0)144 220.8 Q .566(If no e)180 220.8 R .566
(xpansions took place \(or)-.15 F 3.065(,i)-.4 G 3.065(ft)-3.065 G .565
(he only change in the te)-3.065 F .565(xt w)-.15 F .565(as the remo)-.1
F -.25(va)-.15 G 3.065(lo).25 G 3.065(fe)-3.065 G(scape)-3.065 E
(characters preceding the history e)180 232.8 Q(xpansion character\);)
-.15 E(1)144 244.8 Q(if e)180 244.8 Q(xpansions did tak)-.15 E 2.5(ep)
-.1 G(lace;)-2.5 E(-1)144 256.8 Q(if there w)180 256.8 Q
(as an error in e)-.1 E(xpansion;)-.15 E(2)144 268.8 Q
(if the returned line should be displayed, b)180 268.8 Q(ut not e)-.2 E
-.15(xe)-.15 G(cuted, as with the).15 E F1(:p)2.5 E F0(modi\214er)2.5 E
(.)-.55 E(If an error occurred in e)108 280.8 Q(xpansion, then)-.15 E F2
(output)2.5 E F0(contains a descripti)2.5 E .3 -.15(ve e)-.25 H
(rror message.).15 E F2 -.15(ch)108 304.8 S(ar *).15 E F1(get_history_e)
2.5 E -.1(ve)-.15 G(nt).1 E F0(\()4.166 E F2(const c)A(har *string)-.15
E 1.666(,i)-.1 G(nt *cinde)-1.666 E -.834(x, int)-.2 F(qc)2.5 E(har)-.15
E F0(\))3.332 E .262(Returns the te)108 316.8 R .262
(xt of the history e)-.15 F -.15(ve)-.25 G .262(nt be).15 F .263
(ginning at)-.15 F F2(string)2.763 E F0(+)2.763 E F2(*cinde)2.763 E(x)
-.2 E F0(.)A F2(*cinde)5.263 E(x)-.2 E F0 .263
(is modi\214ed to point to after the)2.763 F -2.15 -.25(ev e)108 328.8 T
.71(nt speci\214er).25 F 5.71(.A)-.55 G 3.21(tf)-5.71 G .71
(unction entry)-3.21 F(,)-.65 E F2(cinde)3.21 E(x)-.2 E F0 .709
(points to the inde)3.21 F 3.209(xi)-.15 G(nto)-3.209 E F2(string)3.209
E F0 .709(where the history e)3.209 F -.15(ve)-.25 G .709
(nt speci\214ca-).15 F .527(tion be)108 340.8 R(gins.)-.15 E F2(qc)5.527
E(har)-.15 E F0 .527(is a character that is allo)3.027 F .527
(wed to end the e)-.25 F -.15(ve)-.25 G .528
(nt speci\214cation in addition to the `).15 F(`normal')-.74 E(')-.74 E
(terminating characters.)108 352.8 Q F2 -.15(ch)108 376.8 S(ar **).15 E
F1(history_tok)2.5 E(enize)-.1 E F0(\()4.166 E F2(const c)A(har *string)
-.15 E F0(\))1.666 E .239(Return an array of tok)108 388.8 R .239
(ens parsed out of)-.1 F F2(string)2.739 E F0 2.739(,m)C .238
(uch as the shell might.)-2.739 F .238(The tok)5.238 F .238
(ens are split on the charac-)-.1 F(ters in the)108 400.8 Q F1
(history_w)2.5 E(ord_delimiters)-.1 E F0 -.25(va)2.5 G
(riable, and shell quoting con).25 E -.15(ve)-.4 G(ntions are obe).15 E
(yed.)-.15 E F2 -.15(ch)108 424.8 S(ar *).15 E F1(history_ar)2.5 E
(g_extract)-.1 E F0(\()4.166 E F2(int \214r)A -.834(st, int)-.1 F -.834
(last, const)2.5 F -.15(ch)2.5 G(ar *string).15 E F0(\))3.332 E .025
(Extract a string se)108 436.8 R .025(gment consisting of the)-.15 F F2
<8c72>2.526 E(st)-.1 E F0(through)2.526 E F2(last)2.526 E F0(ar)2.526 E
.026(guments present in)-.18 F F2(string)2.526 E F0 5.026(.A)C -.18(rg)
-5.026 G .026(uments are split).18 F(using)108 448.8 Q F1(history_tok)
2.5 E(enize\(\))-.1 E F0(.)A F1(History V)87 477.6 Q(ariables)-.92 E F0
(This section describes the e)108 489.6 Q(xternally-visible v)-.15 E
(ariables e)-.25 E(xported by the GNU History Library)-.15 E(.)-.65 E F2
(int)108 513.6 Q F1(history_base)2.5 E F0(The logical of)108 525.6 Q
(fset of the \214rst entry in the history list.)-.25 E F2(int)108 549.6
Q F1(history_length)2.5 E F0
(The number of entries currently stored in the history list.)108 561.6 Q
F2(int)108 585.6 Q F1(history_max_entries)2.5 E F0
(The maximum number of history entries.)108 597.6 Q
(This must be changed using)5 E F1(sti\215e_history\(\))2.5 E F0(.)A F2
(int)108 621.6 Q F1(history_write_timestamps)2.5 E F0 .484
(If non-zero, timestamps are written to the history \214le, so the)108
633.6 R 2.983(yc)-.15 G .483(an be preserv)-2.983 F .483
(ed between sessions.)-.15 F .483(The de-)5.483 F -.1(fa)108 645.6 S
.994(ult v).1 F .994(alue is 0, meaning that timestamps are not sa)-.25
F -.15(ve)-.2 G 3.494(d. The).15 F .994
(current timestamp format uses the v)3.494 F .995(alue of)-.25 F F2
(history_comment_c)108 657.6 Q(har)-.15 E F0 .051
(to delimit timestamp entries in the history \214le.)2.552 F .051
(If that v)5.051 F .051(ariable does not ha)-.25 F .351 -.15(ve a v)-.2
H(alue)-.1 E(\(the def)108 669.6 Q
(ault\), timestamps will not be written.)-.1 E F2 -.15(ch)108 693.6 S
(ar).15 E F1(history_expansion_char)2.5 E F0
(The character that introduces a history e)108 705.6 Q -.15(ve)-.25 G
2.5(nt. The).15 F(def)2.5 E(ault is)-.1 E F1(!)2.5 E F0 5(.S)C
(etting this to 0 inhibits history e)-5 E(xpansion.)-.15 E F2 -.15(ch)
108 729.6 S(ar).15 E F1(history_subst_char)2.5 E F0(GNU History 8.1)72
768 Q(2020 July 17)139.005 E(6)203.165 E 0 Cg EP
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/F0 10/Times-Roman@0 SF(HIST)72 48 Q(OR)-.18 E 124.845(Y\(3\) Library)
-.65 F(Functions Manual)2.5 E(HIST)127.345 E(OR)-.18 E(Y\(3\))-.65 E
(The character that in)108 84 Q -.2(vo)-.4 G -.1(ke).2 G 2.5(sw).1 G
(ord substitution if found at the start of a line.)-2.6 E(The def)5 E
(ault is)-.1 E/F1 10/Times-Bold@0 SF(^)2.5 E F0(.)A/F2 10/Times-Italic@0
SF -.15(ch)108 108 S(ar).15 E F1(history_comment_char)2.5 E F0 .116
(During tok)108 120 R .117
(enization, if this character is seen as the \214rst character of a w)
-.1 F .117(ord, then it and all subsequent char)-.1 F(-)-.2 E .277
(acters up to a ne)108 132 R .276
(wline are ignored, suppressing history e)-.25 F .276
(xpansion for the remainder of the line.)-.15 F .276(This is dis-)5.276
F(abled by def)108 144 Q(ault.)-.1 E F2 -.15(ch)108 168 S(ar *).15 E F1
(history_w)2.5 E(ord_delimiters)-.1 E F0
(The characters that separate tok)108 180 Q(ens for)-.1 E F1
(history_tok)2.5 E(enize\(\))-.1 E F0 5(.T)C(he def)-5 E(ault v)-.1 E
(alue is)-.25 E F1 2.5("\\)2.5 G(t\\n\(\)<>;&|")-2.5 E F0(.)A F2 -.15
(ch)108 204 S(ar *).15 E F1(history_no_expand_chars)2.5 E F0 2.054
(The list of characters which inhibit history e)108 216 R 2.054
(xpansion if found immediately follo)-.15 F(wing)-.25 E F1
(history_expan-)4.555 E(sion_char)108 228 Q F0 5(.T)C(he def)-5 E
(ault is space, tab, ne)-.1 E(wline,)-.25 E F1(\\r)2.5 E F0 2.5(,a)C(nd)
-2.5 E F1(=)2.5 E F0(.)A F2 -.15(ch)108 252 S(ar *).15 E F1
(history_sear)2.5 E(ch_delimiter_chars)-.18 E F0 .401(The list of addit\
ional characters which can delimit a history search string, in addition\
 to space, tab,)108 264 R F2(:)2.901 E F0(and)2.901 E F2(?)2.901 E F0
(in the case of a substring search.)108 276 Q(The def)5 E(ault is empty)
-.1 E(.)-.65 E F2(int)108 300 Q F1(history_quotes_inhibit_expansion)2.5
E F0 .86(If non-zero, double-quoted w)108 312 R .861
(ords are not scanned for the history e)-.1 F .861
(xpansion character or the history com-)-.15 F(ment character)108 324 Q
5(.T)-.55 G(he def)-5 E(ault v)-.1 E(alue is 0.)-.25 E F2(rl_lineb)108
348 Q(uf_func_t *)-.2 E F1(history_inhibit_expansion_function)2.5 E F0
.348(This should be set to the address of a function that tak)108 360 R
.348(es tw)-.1 F 2.848(oa)-.1 G -.18(rg)-2.848 G .347(uments: a).18 F F1
.347(char *)2.847 F F0(\()2.847 E F2(string)A F0 2.847(\)a)C .347(nd an)
-2.847 F F1(int)2.847 E F0(inde)2.847 E(x)-.15 E .227
(into that string \()108 372 R F2(i)A F0 2.727(\). It)B .227
(should return a non-zero v)2.727 F .227(alue if the history e)-.25 F
.227(xpansion starting at)-.15 F F2(string[i])2.728 E F0 .228
(should not)2.728 F .019(be performed; zero if the e)108 384 R .019
(xpansion should be done.)-.15 F .019
(It is intended for use by applications lik)5.019 F(e)-.1 E F1(bash)
2.519 E F0 .018(that use)2.519 F(the history e)108 396 Q
(xpansion character for additional purposes.)-.15 E(By def)5 E
(ault, this v)-.1 E(ariable is set to)-.25 E F1(NULL)2.5 E F0(.)A/F3
10.95/Times-Bold@0 SF(FILES)72 412.8 Q F2(~/.history)109.666 424.8 Q F0
(Def)144 436.8 Q(ault \214lename for reading and writing sa)-.1 E -.15
(ve)-.2 G 2.5(dh).15 G(istory)-2.5 E F3(SEE ALSO)72 453.6 Q F2
(The Gnu Readline Libr)108 465.6 Q(ary)-.15 E F0 2.5(,B)C(rian F)-2.5 E
(ox and Chet Rame)-.15 E(y)-.15 E F2(The Gnu History Libr)108 477.6 Q
(ary)-.15 E F0 2.5(,B)C(rian F)-2.5 E(ox and Chet Rame)-.15 E(y)-.15 E
F2(bash)108 489.6 Q F0(\(1\))A F2 -.37(re)108 501.6 S(adline).37 E F0
(\(3\))A F3 -.548(AU)72 518.4 S(THORS).548 E F0(Brian F)108 530.4 Q
(ox, Free Softw)-.15 E(are F)-.1 E(oundation)-.15 E(bfox@gnu.or)108
542.4 Q(g)-.18 E(Chet Rame)108 559.2 Q 1.3 -.65(y, C)-.15 H(ase W).65 E
(estern Reserv)-.8 E 2.5(eU)-.15 G(ni)-2.5 E -.15(ve)-.25 G(rsity).15 E
(chet.rame)108 571.2 Q(y@case.edu)-.15 E F3 -.11(BU)72 588 S 2.738(GR)
.11 G(EPOR)-2.738 E(TS)-.438 E F0 .16(If you \214nd a b)108 600 R .16
(ug in the)-.2 F F1(history)2.66 E F0(library)2.66 E 2.66(,y)-.65 G .16
(ou should report it.)-2.66 F .16(But \214rst, you should mak)5.16 F
2.66(es)-.1 G .16(ure that it really is)-2.66 F 2.5(ab)108 612 S
(ug, and that it appears in the latest v)-2.7 E(ersion of the)-.15 E F1
(history)2.5 E F0(library that you ha)2.5 E -.15(ve)-.2 G(.).15 E .705
(Once you ha)108 628.8 R 1.005 -.15(ve d)-.2 H .705(etermined that a b)
.15 F .704(ug actually e)-.2 F .704(xists, mail a b)-.15 F .704
(ug report to)-.2 F F2 -.2(bu)3.204 G(g\255r).2 E(eadline)-.37 E F0(@)A
F2(gnu.or)A(g)-.37 E F0 5.704(.I)C 3.204(fy)-5.704 G(ou)-3.204 E(ha)108
640.8 Q 1.809 -.15(ve a \214)-.2 H 1.509
(x, you are welcome to mail that as well!).15 F 1.51
(Suggestions and `philosophical' b)6.51 F 1.51(ug reports may be)-.2 F
(mailed to)108 652.8 Q F2 -.2(bu)2.5 G(g-r).2 E(eadline)-.37 E F0(@)A F2
(gnu.or)A(g)-.37 E F0(or posted to the Usenet ne)2.5 E(wsgroup)-.25 E F1
(gnu.bash.b)2.5 E(ug)-.2 E F0(.)A(Comments and b)108 669.6 Q
(ug reports concerning this manual page should be directed to)-.2 E F2
-.15(ch)2.5 G(et.r).15 E(ame)-.15 E(y@case)-.3 E(.edu)-.15 E F0(.).25 E
(GNU History 8.1)72 768 Q(2020 July 17)139.005 E(7)203.165 E 0 Cg EP
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