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        !            23: .\" DO NOT EDIT. Generated by the curl project gen.pl man page generator.
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        !            25: .TH curl 1 "16 Dec 2016" "Curl 7.52.0" "Curl Manual"
        !            26: .SH NAME
        !            27: curl \- transfer a URL
        !            28: .SH SYNOPSIS
        !            29: .B curl [options / URLs]
        !            30: .SH DESCRIPTION
        !            31: .B curl
        !            32: is a tool to transfer data from or to a server, using one of the supported
        !            33: protocols (DICT, FILE, FTP, FTPS, GOPHER, HTTP, HTTPS, IMAP, IMAPS, LDAP,
        !            34: LDAPS, MQTT, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS,
        !            35: TELNET and TFTP). The command is designed to work without user interaction.
        !            36: 
        !            37: curl offers a busload of useful tricks like proxy support, user
        !            38: authentication, FTP upload, HTTP post, SSL connections, cookies, file transfer
        !            39: resume, Metalink, and more. As you will see below, the number of features will
        !            40: make your head spin!
        !            41: 
        !            42: curl is powered by libcurl for all transfer-related features. See
        !            43: \fIlibcurl(3)\fP for details.
        !            44: .SH URL
        !            45: The URL syntax is protocol-dependent. You'll find a detailed description in
        !            46: RFC 3986.
        !            47: 
        !            48: You can specify multiple URLs or parts of URLs by writing part sets within
        !            49: braces and quoting the URL as in:
        !            50: 
        !            51:   "http://site.{one,two,three}.com"
        !            52: 
        !            53: or you can get sequences of alphanumeric series by using [] as in:
        !            54: 
        !            55:   ftp://ftp.example.com/file[1-100].txt
        !            56: 
        !            57:   ftp://ftp.example.com/file[001-100].txt    (with leading zeros)
        !            58: 
        !            59:   ftp://ftp.example.com/file[a-z].txt
        !            60: 
        !            61: Nested sequences are not supported, but you can use several ones next to each
        !            62: other:
        !            63: 
        !            64:   http://example.com/archive[1996-1999]/vol[1-4]/part{a,b,c}.html
        !            65: 
        !            66: You can specify any amount of URLs on the command line. They will be fetched
        !            67: in a sequential manner in the specified order. You can specify command line
        !            68: options and URLs mixed and in any order on the command line.
        !            69: 
        !            70: You can specify a step counter for the ranges to get every Nth number or
        !            71: letter:
        !            72: 
        !            73:   http://example.com/file[1-100:10].txt
        !            74: 
        !            75:   http://example.com/file[a-z:2].txt
        !            76: 
        !            77: When using [] or {} sequences when invoked from a command line prompt, you
        !            78: probably have to put the full URL within double quotes to avoid the shell from
        !            79: interfering with it. This also goes for other characters treated special, like
        !            80: for example '&', '?' and '*'.
        !            81: 
        !            82: Provide the IPv6 zone index in the URL with an escaped percentage sign and the
        !            83: interface name. Like in
        !            84: 
        !            85:   http://[fe80::3%25eth0]/
        !            86: 
        !            87: If you specify URL without protocol:// prefix, curl will attempt to guess what
        !            88: protocol you might want. It will then default to HTTP but try other protocols
        !            89: based on often-used host name prefixes. For example, for host names starting
        !            90: with "ftp." curl will assume you want to speak FTP.
        !            91: 
        !            92: curl will do its best to use what you pass to it as a URL. It is not trying to
        !            93: validate it as a syntactically correct URL by any means but is instead
        !            94: \fBvery\fP liberal with what it accepts.
        !            95: 
        !            96: curl will attempt to re-use connections for multiple file transfers, so that
        !            97: getting many files from the same server will not do multiple connects /
        !            98: handshakes. This improves speed. Of course this is only done on files
        !            99: specified on a single command line and cannot be used between separate curl
        !           100: invokes.
        !           101: .SH "PROGRESS METER"
        !           102: curl normally displays a progress meter during operations, indicating the
        !           103: amount of transferred data, transfer speeds and estimated time left, etc. The
        !           104: progress meter displays number of bytes and the speeds are in bytes per
        !           105: second. The suffixes (k, M, G, T, P) are 1024 based. For example 1k is 1024
        !           106: bytes. 1M is 1048576 bytes.
        !           107: 
        !           108: curl displays this data to the terminal by default, so if you invoke curl to
        !           109: do an operation and it is about to write data to the terminal, it
        !           110: \fIdisables\fP the progress meter as otherwise it would mess up the output
        !           111: mixing progress meter and response data.
        !           112: 
        !           113: If you want a progress meter for HTTP POST or PUT requests, you need to
        !           114: redirect the response output to a file, using shell redirect (>), --output or
        !           115: similar.
        !           116: 
        !           117: It is not the same case for FTP upload as that operation does not spit out
        !           118: any response data to the terminal.
        !           119: 
        !           120: If you prefer a progress "bar" instead of the regular meter, --progress-bar is
        !           121: your friend. You can also disable the progress meter completely with the
        !           122: --silent option.
        !           123: .SH OPTIONS
        !           124: Options start with one or two dashes. Many of the options require an
        !           125: additional value next to them.
        !           126: 
        !           127: The short "single-dash" form of the options, -d for example, may be used with
        !           128: or without a space between it and its value, although a space is a recommended
        !           129: separator. The long "double-dash" form, --data for example, requires a space
        !           130: between it and its value.
        !           131: 
        !           132: Short version options that don't need any additional values can be used
        !           133: immediately next to each other, like for example you can specify all the
        !           134: options -O, -L and -v at once as -OLv.
        !           135: 
        !           136: In general, all boolean options are enabled with --\fBoption\fP and yet again
        !           137: disabled with --\fBno-\fPoption. That is, you use the exact same option name
        !           138: but prefix it with "no-". However, in this list we mostly only list and show
        !           139: the --option version of them. (This concept with --no options was added in
        !           140: 7.19.0. Previously most options were toggled on/off on repeated use of the
        !           141: same command line option.)