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-.\" $NetBSD: tar.1,v 1.37 2017/07/03 21:33:23 wiz Exp $
-.\"
-.\" Copyright (c) 1996 SigmaSoft, Th. Lockert
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\" notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\" notice, this list of conditions and the following disclaimer in the
-.\" documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
-.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
-.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.\" OpenBSD: tar.1,v 1.28 2000/11/09 23:58:56 aaron Exp
-.\"
-.Dd December 19, 2015
-.Dt TAR 1
-.Os
-.Sh NAME
-.Nm tar
-.Nd tape archiver
-.Sh SYNOPSIS
-.Nm tar
-.Sm off
-.Oo \&- Oc {crtux} Op Fl 014578befHhJjklmOoPpqSvwXZz
-.Sm on
-.Op Ar archive
-.Op Ar blocksize
-.\" XXX how to do this right?
-.Op Fl C Ar directory
-.Op Fl s Ar replstr
-.Op Fl T Ar file
-.Op Ar file ...
-.Sh DESCRIPTION
-The
-.Nm
-command creates, adds files to, or extracts files from an
-archive file in
-.Dq tar
-format.
-A tar archive is often stored on a magnetic tape, but can be
-stored equally well on a floppy, CD-ROM, or in a regular disk file.
-.Pp
-One of the following flags must be present:
-.Bl -tag -width Ar
-.It Fl c , Fl Fl create
-Create new archive, or overwrite an existing archive,
-adding the specified files to it.
-.It Fl r , Fl Fl append
-Append the named new files to existing archive.
-Note that this will only work on media on which an end-of-file mark
-can be overwritten.
-.It Fl t , Fl Fl list
-List contents of archive.
-If any files are named on the
-command line, only those files will be listed.
-.It Fl u , Fl Fl update
-Alias for
-.Fl r .
-.It Fl x , Fl Fl extract , Fl Fl get
-Extract files from archive.
-If any files are named on the
-command line, only those files will be extracted from the
-archive.
-If more than one copy of a file exists in the
-archive, later copies will overwrite earlier copies during
-extraction.
-The file mode and modification time are preserved
-if possible.
-The file mode is subject to modification by the
-.Xr umask 2 .
-.El
-.Pp
-In addition to the flags mentioned above, any of the following
-flags may be used:
-.Bl -tag -width Ar
-.It Fl b Ar "blocking factor" , Fl Fl block-size Ar "blocking factor"
-Set blocking factor to use for the archive.
-.Nm
-uses 512 byte blocks.
-The default is 20, the maximum is 126.
-Archives with a blocking factor larger 63 violate the
-.Tn POSIX
-standard and will not be portable to all systems.
-.It Fl e
-Stop after first error.
-.It Fl f Ar archive , Fl Fl file Ar archive
-Filename where the archive is stored.
-Defaults to
-.Pa /dev/rst0 .
-If the archive is of the form:
-.Ar [[user@]host:]file
-then the archive will be processed using
-.Xr rmt 8 .
-.It Fl h , Fl Fl dereference
-Follow symbolic links as if they were normal files
-or directories.
-.It Fl J, Fl Fl xz
-Compress/decompress archive using
-.Xr xz 1 .
-.It Fl j, Fl Fl bzip2, Fl Fl bunzip2
-Use
-.Xr bzip2 1
-for compression of the archive.
-This option is a GNU extension.
-.It Fl k , Fl Fl keep-old-files
-Keep existing files; don't overwrite them from archive.
-.It Fl l , Fl Fl one-file-system
-Do not descend across mount points.
-.\" should be '-X'
-.It Fl m , Fl Fl modification-time
-Do not preserve modification time.
-.It Fl O
-When creating and appending to an archive, write old-style (non-POSIX) archives.
-When extracting from an archive, extract to standard output.
-.It Fl o , Fl Fl portability , Fl Fl old-archive
-Don't write directory information that the older (V7) style
-.Nm
-is unable to decode.
-This implies the
-.Fl O
-flag.
-.It Fl p , Fl Fl preserve-permissions , Fl Fl preserve
-Preserve user and group ID as well as file mode regardless of
-the current
-.Xr umask 2 .
-The setuid and setgid bits are only preserved if the user is
-the superuser.
-Only meaningful in conjunction with the
-.Fl x
-flag.
-.It Fl q , Fl Fl fast-read
-Select the first archive member that matches each
-.Ar pattern
-operand.
-No more than one archive member is matched for each
-.Ar pattern .
-When members of type directory are matched, the file hierarchy rooted at that
-directory is also matched.
-.It Fl S , Fl Fl sparse
-This flag has no effect as
-.Nm
-always generates sparse files.
-.It Fl s Ar replstr
-Modify the file or archive member names specified by the
-.Ar pattern
-or
-.Ar file
-operands according to the substitution expression
-.Ar replstr ,
-using the syntax of the
-.Xr ed 1
-utility regular expressions.
-The format of these regular expressions are:
-.Dl /old/new/[gps]
-As in
-.Xr ed 1 ,
-.Cm old
-is a basic regular expression and
-.Cm new
-can contain an ampersand (&), \en (where n is a digit) back-references,
-or subexpression matching.
-The
-.Cm old
-string may also contain
-.Aq Dv newline
-characters.
-Any non-null character can be used as a delimiter (/ is shown here).
-Multiple
-.Fl s
-expressions can be specified.
-The expressions are applied in the order they are specified on the
-command line, terminating with the first successful substitution.
-The optional trailing
-.Cm g
-continues to apply the substitution expression to the pathname substring
-which starts with the first character following the end of the last successful
-substitution.
-The first unsuccessful substitution stops the operation of the
-.Cm g
-option.
-The optional trailing
-.Cm p
-will cause the final result of a successful substitution to be written to
-.Dv standard error
-in the following format:
-.Dl <original pathname> >> <new pathname>
-File or archive member names that substitute to the empty string
-are not selected and will be skipped.
-The substitutions are applied by default to the destination hard and symbolic
-links.
-The optional trailing
-.Cm s
-prevents the substitutions from being performed on symbolic link destinations.
-.It Fl v
-Verbose operation mode.
-.It Fl w , Fl Fl interactive , Fl Fl confirmation
-Interactively rename files.
-This option causes
-.Nm
-to prompt the user for the filename to use when storing or
-extracting files in an archive.
-.It Fl z , Fl Fl gzip , Fl Fl gunzip
-Compress/decompress archive using
-.Xr gzip 1 .
-.It Fl B , Fl Fl read-full-blocks
-Reassemble small reads into full blocks (For reading from 4.2BSD pipes).
-.It Fl C Ar directory , Fl Fl directory Ar directory
-This is a positional argument which sets the working directory for the
-following files.
-When extracting, files will be extracted into
-the specified directory; when creating, the specified files will be matched
-from the directory.
-This argument and its parameter may also appear in a file list specified by
-.Fl T .
-.It Fl H
-Only follow symlinks given on command line.
-.Pp
-Note SysVr3/i386 picked up ISC/SCO UNIX compatibility which implemented
-.Dq Fl F Ar file
-which was defined as obtaining a list of command line switches and files
-on which to operate from the specified file,
-but SunOS-5 uses
-.Dq Fl I Ar file
-because they use
-.Sq Fl F
-to mean something else.
-We might someday provide SunOS-5 compatibility
-but it makes little sense to confuse things with ISC/SCO compatibility.
-.\".It Fl L
-.\"Do not follow any symlinks (do the opposite of
-.\".Fl h ).
-.It Fl P , Fl Fl absolute-paths
-Do not strip leading slashes
-.Pq Sq /
-from pathnames.
-The default is to strip leading slashes.
-.It Fl T Ar file , Fl Fl files-from Ar file
-Read the names of files to archive or extract from the given file, one
-per line.
-A line may also specify the positional argument
-.Dq Fl C Ar directory .
-.It Fl X Ar file , Fl Fl exclude-from Ar file
-Exclude files matching the shell glob patterns listed in the given file.
-.\" exclude should be '-E' and '-X' should be one-file-system
-.Pp
-Note that it would be more standard to use this option to mean ``do not
-cross filesystem mount points.''
-.It Fl Z , Fl Fl compress , Fl Fl uncompress
-Compress archive using compress.
-.It Fl Fl strict
-Do not enable GNU tar extensions such as long filenames and long link names.
-.It Fl Fl atime-preserve
-Preserve file access times.
-.It Fl Fl chroot
-.Fn chroot
-to the current directory before extracting files.
-Use with
-.Fl x
-and
-.Fl h
-to make absolute symlinks relative to the current directory.
-.It Fl Fl unlink
-Ignored, only accepted for compatibility with other
-.Nm
-implementations.
-.Nm
-always unlinks files before creating them.
-.It Fl Fl use-compress-program Ar program
-Use the named program as the program to decompress the input.
-.It Fl Fl force-local
-Do not interpret filenames that contain a
-.Sq \&:
-as remote files.
-.It Fl Fl insecure
-Normally
-.Nm
-ignores filenames that contain
-.Dq ..
-as a path component.
-With this option, files that contain
-.Dq ..
-can be processed.
-.It Fl Fl no-recursion
-Cause files of type directory being copied or archived, or archive members of
-type directory being extracted, to match only the directory file or archive
-member and not the file hierarchy rooted at the directory.
-.It Fl Fl timestamp Ar timestamp
-Store all modification times in the archive with the
-.Ar timestamp
-given instead of the actual modification time of the individual archive member
-so that repeatable builds are possible.
-The
-.Ar timestamp
-can be a
-.Pa pathname ,
-where the timestamps are derived from that file, a parseable date for
-.Xr parsedate 3
-(this option is not yet available in the tools build), or an integer value
-interpreted as the number of seconds from the Epoch.
-.El
-.Pp
-The options
-.Op Fl 014578
-can be used to select one of the compiled-in backup devices,
-.Pa /dev/rstN .
-.Sh FILES
-.Bl -tag -width "/dev/rst0"
-.It Pa /dev/rst0
-default archive name
-.El
-.Sh DIAGNOSTICS
-.Nm
-will exit with one of the following values:
-.Bl -tag -width 2n
-.It 0
-All files were processed successfully.
-.It 1
-An error occurred.
-.El
-.Pp
-Whenever
-.Nm
-cannot create a file or a link when extracting an archive or cannot
-find a file while writing an archive, or cannot preserve the user
-ID, group ID, file mode, or access and modification times when the
-.Fl p
-option is specified, a diagnostic message is written to standard
-error and a non-zero exit value will be returned, but processing
-will continue.
-In the case where
-.Nm
-cannot create a link to a file,
-.Nm
-will not create a second copy of the file.
-.Pp
-If the extraction of a file from an archive is prematurely terminated
-by a signal or error,
-.Nm
-may have only partially extracted the file the user wanted.
-Additionally, the file modes of extracted files and directories may
-have incorrect file bits, and the modification and access times may
-be wrong.
-.Pp
-If the creation of an archive is prematurely terminated by a signal
-or error,
-.Nm
-may have only partially created the archive which may violate the
-specific archive format specification.
-.Sh SEE ALSO
-.Xr cpio 1 ,
-.Xr pax 1
-.Sh HISTORY
-A
-.Nm
-command first appeared in
-.At v7 .
-.Sh AUTHORS
-.An Keith Muller
-at the University of California, San Diego.