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7f92799f67
fetch(1) accepts a new argument -i <file> that if specified will cause the file to be downloaded only if it is more recent than the mtime of <file>. libfetch(3) accepts the mtime in the url structure and a flag to indicate when this behavior is desired. PR: bin/87841 Submitted by: Jukka A. Ukkonen <jau@iki.fi> (partially) Reviewed by: des, ru MFC after: 3 weeks
304 lines
8.0 KiB
Groff
304 lines
8.0 KiB
Groff
.\"-
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.\" Copyright (c) 2000-2004 Dag-Erling Coïdan Smørgrav
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.\" All rights reserved.
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.\" Portions Copyright (c) 1999 Massachusetts Institute of Technology; used
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.\" by permission.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer
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.\" in this position and unchanged.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 14, 2008
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.Dt FETCH 1
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.Os
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.Sh NAME
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.Nm fetch
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.Nd retrieve a file by Uniform Resource Locator
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.Sh SYNOPSIS
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.Nm
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.Op Fl 146AadFlMmnPpqRrsUv
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.Op Fl B Ar bytes
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.Op Fl i Ar file
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.Op Fl N Ar file
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.Op Fl o Ar file
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.Op Fl S Ar bytes
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.Op Fl T Ar seconds
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.Op Fl w Ar seconds
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.Ar URL ...
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.Nm
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.Op Fl 146AadFlMmnPpqRrsUv
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.Op Fl B Ar bytes
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.Op Fl i Ar file
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.Op Fl N Ar file
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.Op Fl o Ar file
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.Op Fl S Ar bytes
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.Op Fl T Ar seconds
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.Op Fl w Ar seconds
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.Fl h Ar host Fl f Ar file Oo Fl c Ar dir Oc
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.Sh DESCRIPTION
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The
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.Nm
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utility provides a command-line interface to the
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.Xr fetch 3
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library.
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Its purpose is to retrieve the file(s) pointed to by the URL(s) on the
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command line.
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.Pp
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The following options are available:
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.Bl -tag -width Fl
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.It Fl 1
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Stop and return exit code 0 at the first successfully retrieved file.
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.It Fl 4
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Forces
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.Nm
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to use IPv4 addresses only.
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.It Fl 6
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Forces
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.Nm
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to use IPv6 addresses only.
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.It Fl A
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Do not automatically follow ``temporary'' (302) redirects.
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Some broken Web sites will return a redirect instead of a not-found
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error when the requested object does not exist.
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.It Fl a
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Automatically retry the transfer upon soft failures.
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.It Fl B Ar bytes
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Specify the read buffer size in bytes.
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The default is 4096 bytes.
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Attempts to set a buffer size lower than this will be silently
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ignored.
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The number of reads actually performed is reported at verbosity level
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two or higher (see the
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.Fl v
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flag).
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.It Fl c Ar dir
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The file to retrieve is in directory
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.Ar dir
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on the remote host.
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This option is deprecated and is provided for backward compatibility
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only.
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.It Fl d
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Use a direct connection even if a proxy is configured.
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.It Fl F
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In combination with the
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.Fl r
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flag, forces a restart even if the local and remote files have
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different modification times.
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Implies
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.Fl R .
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.It Fl f Ar file
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The file to retrieve is named
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.Ar file
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on the remote host.
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This option is deprecated and is provided for backward compatibility
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only.
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.It Fl h Ar host
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The file to retrieve is located on the host
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.Ar host .
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This option is deprecated and is provided for backward compatibility
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only.
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.It Fl i Ar file
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If-Modified-Since mode: the remote file will only be retrieved if it
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is newer than
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.Ar file
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on the local host.
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(HTTP only)
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.It Fl l
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If the target is a file-scheme URL, make a symbolic link to the target
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rather than trying to copy it.
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.It Fl M
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.It Fl m
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Mirror mode: if the file already exists locally and has the same size
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and modification time as the remote file, it will not be fetched.
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Note that the
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.Fl m
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and
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.Fl r
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flags are mutually exclusive.
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.It Fl N Ar file
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Use
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.Ar file
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instead of
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.Pa ~/.netrc
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to look up login names and passwords for FTP sites.
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See
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.Xr ftp 1
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for a description of the file format.
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This feature is experimental.
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.It Fl n
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Do not preserve the modification time of the transferred file.
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.It Fl o Ar file
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Set the output file name to
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.Ar file .
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By default, a ``pathname'' is extracted from the specified URI, and
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its basename is used as the name of the output file.
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A
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.Ar file
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argument of
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.Sq Li \&-
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indicates that results are to be directed to the standard output.
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If the
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.Ar file
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argument is a directory, fetched file(s) will be placed within the
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directory, with name(s) selected as in the default behaviour.
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.It Fl P
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.It Fl p
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Use passive FTP.
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This is useful if you are behind a firewall which blocks incoming
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connections.
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Try this flag if
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.Nm
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seems to hang when retrieving FTP URLs.
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.It Fl q
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Quiet mode.
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.It Fl R
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The output files are precious, and should not be deleted under any
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circumstances, even if the transfer failed or was incomplete.
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.It Fl r
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Restart a previously interrupted transfer.
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Note that the
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.Fl m
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and
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.Fl r
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flags are mutually exclusive.
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.It Fl S Ar bytes
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Require the file size reported by the server to match the specified
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value.
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If it does not, a message is printed and the file is not fetched.
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If the server does not support reporting file sizes, this option is
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ignored and the file is fetched unconditionally.
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.It Fl s
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Print the size in bytes of each requested file, without fetching it.
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.It Fl T Ar seconds
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Set timeout value to
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.Ar seconds .
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Overrides the environment variables
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.Ev FTP_TIMEOUT
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for FTP transfers or
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.Ev HTTP_TIMEOUT
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for HTTP transfers if set.
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.It Fl U
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When using passive FTP, allocate the port for the data connection from
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the low (default) port range.
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See
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.Xr ip 4
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for details on how to specify which port range this corresponds to.
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.It Fl v
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Increase verbosity level.
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.It Fl w Ar seconds
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When the
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.Fl a
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flag is specified, wait this many seconds between successive retries.
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.El
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.Pp
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If
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.Nm
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receives a
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.Dv SIGINFO
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signal (see the
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.Cm status
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argument for
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.Xr stty 1 ) ,
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the current transfer rate statistics will be written to the
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standard error output, in the same format as the standard completion
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message.
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.Sh ENVIRONMENT
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.Bl -tag -width HTTP_TIMEOUT
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.It Ev FTP_TIMEOUT
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Maximum time, in seconds, to wait before aborting an FTP connection.
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.It Ev HTTP_TIMEOUT
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Maximum time, in seconds, to wait before aborting an HTTP connection.
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.El
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.Pp
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See
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.Xr fetch 3
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for a description of additional environment variables, including
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.Ev FETCH_BIND_ADDRESS ,
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.Ev FTP_LOGIN ,
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.Ev FTP_PASSIVE_MODE ,
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.Ev FTP_PASSWORD ,
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.Ev FTP_PROXY ,
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.Ev ftp_proxy ,
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.Ev HTTP_AUTH ,
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.Ev HTTP_PROXY ,
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.Ev http_proxy ,
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.Ev HTTP_PROXY_AUTH ,
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.Ev HTTP_REFERER ,
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.Ev HTTP_USER_AGENT ,
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.Ev NETRC ,
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.Ev NO_PROXY and
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.Ev no_proxy .
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.Sh EXIT STATUS
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The
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.Nm
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command returns zero on success, or one on failure.
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If multiple URLs are listed on the command line,
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.Nm
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will attempt to retrieve each one of them in turn, and will return
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zero only if they were all successfully retrieved.
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.Pp
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If the
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.Fl i
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argument is used and the remote file is not newer than the
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specified file then the command will still return success,
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although no file is transferred.
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.Sh SEE ALSO
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.Xr fetch 3
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Fx 2.1.5 .
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This implementation first appeared in
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.Fx 4.1 .
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.Sh AUTHORS
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.An -nosplit
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The original implementation of
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.Nm
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was done by
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.An Jean-Marc Zucconi Aq jmz@FreeBSD.org .
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It was extensively re-worked for
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.Fx 2.2
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by
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.An Garrett Wollman Aq wollman@FreeBSD.org ,
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and later completely rewritten to use the
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.Xr fetch 3
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library by
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.An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .
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.Sh NOTES
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The
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.Fl b
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and
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.Fl t
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options are no longer supported and will generate warnings.
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They were workarounds for bugs in other OSes which this implementation
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does not trigger.
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.Pp
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One cannot both use the
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.Fl h ,
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.Fl c
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and
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.Fl f
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options and specify URLs on the command line.
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