243 lines
6.9 KiB
Groff
243 lines
6.9 KiB
Groff
.\"-
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.\" Copyright (c) 2000 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 June 28, 2000
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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 146AFHMPRadlmnpqrsv
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.Op Fl B Ar bytes
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.Op Fl S Ar bytes
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.Op Fl T Ar seconds
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.Op Fl o Ar file
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.Op Fl w Ar seconds
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.Op Fl h Ar host
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.Op Fl c Ar dir
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.Op Fl f Ar file
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.Op Ar URL ...
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.Sh DESCRIPTION
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.Nm Fetch
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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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.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
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When using passive FTP, allocate a high port for the data connection.
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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 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 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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.It Fl n
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Don't 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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.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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This works by setting the verbosity level to zero; see the
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.Fl v
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option.
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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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.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 t
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Work around a different set of buggy
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.Tn TCP
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implementations.
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.It Fl v
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Each instance of this flag increases the verbosity level by one.
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Level one (the default) only gives a summary after each file; level
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two show a running count during the transfer, provided that the
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standard output goes to a terminal; level three enables messages from
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the
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.Xr fetch 3
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library.
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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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.Sh DIAGNOSTICS
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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 them each of them in turn, and return zero
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only if they were all successfully retrieved.
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.Sh ENVIRONMENT
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.Bl -tag -width FTP_PASSIVE_MODE -offset indent
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.It Ev FTP_TIMEOUT
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maximum time, in seconds, to wait before aborting an
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.Tn FTP
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connection.
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.It Ev HTTP_TIMEOUT
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maximum time, in seconds, to wait before aborting an
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.Tn HTTP
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connection.
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.El
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.Pp
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All environment variables mentioned in the documentation for the
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.Xr fetch 3
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library are supported.
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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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The original implementation of
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.Nm
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was done by
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.An Jean-Marc Zucconi .
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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 ,
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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 Smørgrav .
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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 and
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.Fl f
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options and specify URLs on the command line.
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