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TAR.MAN
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1990-02-25
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TAR(1) UNIX Programmer's Manual TAR(1)
NAME
tar - process tape archives
SYNOPSIS
tar -c[bfvw] device block filename...
tar -r[bvw] device block [filename...]
tar -t[fv] device
tar -u[bvw] device block
tar -x[flmovw] device [filename...]
DESCRIPTION
Tar reads and writes archive files which conform to the
Archive/Interchange File Format specified in IEEE Std.
1003.1-1988.
Options
The following options are available:
-c Creates a new archive; writing begins at the
beginning of the archive, instead of after the
last file.
-r Writes names files to the end of the archive.
-t Lists the names of all of the files in the
archive.
-u Causes named files to be added to the archive if
they are not already there, or have been modified
since last written into the archive. This implies
the -r option.
-x Extracts named files from the archive. If a named
file matches a directory whose contents had been
written onto the archive, that directory is recur-
sively extracted. If a named file in the archive
does not exist on the system, the file is create
with the same mode as the one in the archive,
except that the set-user-id and get-group-id modes
are not set unless the user has appropriate
privileges.
If the files exist, their modes are not changed except as
described above. The owner, group and modification time are
restored if possible. If no filename argument is given, the
entire contents of the archive is extracted. Note that if
several files with the same name are in the archive, the
last one will overwrite all earlier ones.
-b Causes tar to use the next argument on the command
line as the blocking factor for tape records. The
default is 1; the maximum is 20. This option
Printed 2/26/90 1
TAR(1) UNIX Programmer's Manual TAR(1)
should only be used with raw magnetic tape
archives. Normally, the block size is determined
automatically when reading tapes.
-f Causes tar to use the next argument on the command
line as the name of the archive instead of the
default, which is usually a tape drive. If - is
specified as a filename tar writes to the standard
output or reads from the standard input, whichever
is appropriate for the options given. Thus, tar
can be used as the head or tail of a pipeline.
-l Tells tar to report if it cannot resolve all of
the links to the files being archived. If -l is
not specified, no error messages are written to
the standard output. This modifier is only valid
with the -c, -r and -u options.
-m Tells tar not to restore the modification times.
The modification time of the file will be the time
of extraction. This modifier is invalid with th
-t option.
-o Causes extracted files to take on the user and
group identifier of the user running the program
rather than those on the archive. This modifier
is only valid with the -x option.
-v Causes tar to operate verbosely. Usually, tar
does its work silently, but the v modifier causes
it to print the name of each file it processes,
preceded by the option letter. With the -t
option, v gives more information about the archive
entries than just the name.
-w Causes tar to print the action to be taken, fol-
lowed by the name of the file, and then wait for
the user's confirmation. If a word beginning with
y is given, the action is performed. Any other
input means "no". This modifier is invalid with
the -t option.
FILES
/dev/tty used to prompt the user for information when the
-i or -y options are specified.
SEE ALSO
cpio(1), dd(1), find(1), pax(1), cpio(5), tar(5)
COPYRIGHT
Copyright (c) 1989 Mark H. Colburn.
All rights reserved.
Printed 2/26/90 2
TAR(1) UNIX Programmer's Manual TAR(1)
Redistribution and use in source and binary forms are per-
mitted provided that the above copyright notice is dupli-
cated in all such forms and that any documentation,
advertising materials, and other materials related to such
distribution and use acknowledge that the software was
developed by Mark H. Colburn.
THE SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PAR-
TICULAR PURPOSE.
AUTHOR
Mark H. Colburn
Minnetech Consulting, Inc.
3232 Aquila Lane
St. Louis Park, MN 55426
mark@Minnetech.MN.ORG
Printed 2/26/90 3