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Man Pages


Manual Reference Pages  -  GTAR (1)

NAME

tar - an archiving utility

CONTENTS

Synopsis
     Traditional usage
     UNIX-style usage
     GNU-style usage
Note
Description
     Option styles
     Operation mode
Options
     Operation modifiers
     Overwrite control
     Output stream selection
     Handling of file attributes
     Device selection and switching
     Device blocking
     Archive format selection
     Compression options
     Local file selection
     File name matching options
     Informative output
     Compatibility options
     Size suffixes
Copyright

SYNOPSIS

    Traditional usage

tar {A|c|d|r|t|u|x} [GnSkUWOmpsMBiajJzZhPlRvwo] [ARG...]

    UNIX-style usage

tar -A [OPTIONS] ARCHIVE ARCHIVE

tar -c [-f ARCHIVE] [OPTIONS] [FILE...]

tar -d [-f ARCHIVE] [OPTIONS] [FILE...]

tar -t [-f ARCHIVE] [OPTIONS] [MEMBER...]

tar -r [-f ARCHIVE] [OPTIONS] [FILE...]

tar -u [-f ARCHIVE] [OPTIONS] [FILE...]

tar -x [-f ARCHIVE] [OPTIONS] [MEMBER...]

    GNU-style usage

tar {--catenate|--concatenate} [OPTIONS] ARCHIVE ARCHIVE

tar --create [--file ARCHIVE] [OPTIONS] [FILE...]

tar {--diff|--compare} [--file ARCHIVE] [OPTIONS] [FILE...]

tar --delete [--file ARCHIVE] [OPTIONS] [MEMBER...]

tar --append [-f ARCHIVE] [OPTIONS] [FILE...]

tar --list [-f ARCHIVE] [OPTIONS] [MEMBER...]

tar --test-label [--file ARCHIVE] [OPTIONS] [LABEL...]

tar --update [--file ARCHIVE] [OPTIONS] [FILE...]

tar --update [-f ARCHIVE] [OPTIONS] [FILE...]

tar {--extract|--get} [-f ARCHIVE] [OPTIONS] [MEMBER...]

NOTE

This manpage is a short description of GNU tar. For a detailed discussion, including examples and usage recommendations, refer to the GNU Tar Manual available in texinfo format. If the info reader and the tar documentation are properly installed on your system, the command

info tar

should give you access to the complete manual.

You can also view the manual using the info mode in emacs(1), or find it in various formats online at

http://www.gnu.org/software/tar/manual

If any discrepancies occur between this manpage and the GNU Tar Manual, the later shall be considered the authoritative source.

DESCRIPTION

GNU tar is an archiving program designed to store multiple files in a single file (an archive), and to manipulate such archives. The archive can be either a regular file or a device (e.g. a tape drive, hence the name of the program, which stands for tape archiver), which can be located either on the local or on a remote machine.

    Option styles

Options to GNU tar can be given in three different styles. In traditional style, the first argument is a cluster of option letters and all subsequent arguments supply arguments to those options that require them. The arguments are read in the same order as the option letters. Any command line words that remain after all options has been processed are treated as non-optional arguments: file or archive member names.

For example, the c option requires creating the archive, the v option requests the verbose operation, and the f option takes an argument that sets the name of the archive to operate upon. The following command, written in the traditional style, instructs tar to store all files from the directory /etc into the archive file etc.tar verbosely listing the files being archived:

tar cfv a.tar /etc

In UNIX or short-option style, each option letter is prefixed with a single dash, as in other command line utilities. If an option takes argument, the argument follows it, either as a separate command line word, or immediately following the option. However, if the option takes an optional argument, the argument must follow the option letter without any intervening whitespace, as in -g/tmp/snar.db.

Any number of options not taking arguments can be clustered together after a single dash, e.g. -vkp. Options that take arguments (whether mandatory or optional), can appear at the end of such a cluster, e.g. -vkpf a.tar.

The example command above written in the short-option style could look like:

tar -cvf a.tar /etc or tar -c -v -f a.tar /etc

In GNU or long-option style, each option begins with two dashes and has a meaningful name, consisting of lower-case letters and dashes. When used, the long option can be abbreviated to its initial letters, provided that this does not create ambiguity. Arguments to long options are supplied either as a separate command line word, immediately following the option, or separated from the option by an equals sign with no intervening whitespace. Optional arguments must always use the latter method.

Here are several ways of writing the example command in this style:

tar --create --file a.tar --verbose /etc or (abbreviating some options): tar --cre --file=a.tar --verb /etc

The options in all three styles can be intermixed, although doing so with old options is not encouraged.

    Operation mode

The options listed in the table below tell GNU tar what operation it is to perform. Exactly one of them must be given. Meaning of non-optional arguments depends on the operation mode requested.
-A, --catenate, --concatenate
  Append archive to the end of another archive. The arguments are treated as the names of archives to append. All archives must be of the same format as the archive they are appended to, otherwise the resulting archive might be unusable with non-GNU implementations of tar. Notice also that when more than one archive is given, the members from archives other than the first one will be accessible in the resulting archive only if using the -i (--ignore-zeros) option.

Compressed archives cannot be concatenated.

-c, --create
  Create a new archive. Arguments supply the names of the files to be archived. Directories are archived recursively, unless the --no-recursion option is given.
-d, --diff, --compare
  Find differences between archive and file system. The arguments are optional and specify archive members to compare. If not given, the current working directory is assumed.
--delete
  Delete from the archive. The arguments supply names of the archive members to be removed. At least one argument must be given.

This option does not operate on compressed archives. There is no short option equivalent.

-r, --append
  Append files to the end of an archive. Arguments have the same meaning as for -c (--create).
-t, --list List the contents of an archive. Arguments are optional. When given, they specify the names of the members to list.
--test-label
  Test the archive volume label and exit. When used without arguments, it prints the volume label (if any) and exits with status 0. When one or more command line arguments are given. tar compares the volume label with each argument. It exits with code 0 if a match is found, and with code 1 otherwise. No output is displayed, unless used together with the -v (--verbose) option.

There is no short option equivalent for this option.

-u, --update
  Append files which are newer than the corresponding copy in the archive. Arguments have the same meaning as with -c and -r options.
-x, --extract, --get
  Extract files from an archive. Arguments are optional. When given, they specify names of the archive members to be extracted.
--show-defaults
  Show built-in defaults for various tar options and exit. No arguments are allowed.
-?, --help Display a short option summary and exit. No arguments allowed.
--usage Display a list of available options and exit. No arguments allowed.
--version
  Print program version and copyright information and exit.

OPTIONS

    Operation modifiers

--check-device
  Check device numbers when creating incremental archives (default).
-g, --listed-incremental=FILE
  Handle new GNU-format incremental backups. FILE is the name of a snapshot file, where tar stores additional information which is used to decide which files changed since the previous incremental dump and, consequently, must be dumped again. If FILE does not exist when creating an archive, it will be created and all files will be added to the resulting archive (the level 0 dump). To create incremental archives of non-zero level N, create a copy of the snapshot file created during the level N-1, and use it as FILE.

When listing or extracting, the actual contents of FILE is not inspected, it is needed only due to syntactical requirements. It is therefore common practice to use /dev/null in its place.

-G, --incremental
  Handle old GNU-format incremental backups.
--ignore-failed-read
  Do not exit with nonzero on unreadable files.
--level=NUMBER
  Set dump level for created listed-incremental archive. Currently only --level=0 is meaningful: it instructs tar to truncate the snapshot file before dumping, thereby forcing a level 0 dump.
-n, --seek Assume the archive is seekable. Normally tar determines automatically whether the archive can be seeked or not. This option is intended for use in cases when such recognition fails. It takes effect only if the archive is open for reading (e.g. with --list or --extract options).               
--no-check-device
  Do not check device numbers when creating incremental archives.
--no-seek Assume the archive is not seekable.
--occurrence[=N]
  Process only the Nth occurrence of each file in the archive. This option is valid only when used with one of the following subcommands: --delete, --diff, --extract or --list and when a list of files is given either on the command line or via the -T option. The default N is 1.
--restrict
  Disable the use of some potentially harmful options.
--sparse-version=MAJOR[.MINOR]
  Set version of the sparse format to use (implies --sparse). This option implies --sparse. Valid argument values are 0.0, 0.1, and 1.0. For a detailed discussion of sparse formats, refer to the GNU Tar Manual, appendix D, "Sparse Formats". Using info reader, it can be accessed running the following command: info tar ’Sparse Formats’.
-S, --sparse
  Handle sparse files efficiently. Some files in the file system may have segments which were actually never written (quite often these are database files created by such systems as DBM). When given this option, tar attempts to determine if the file is sparse prior to archiving it, and if so, to reduce the resulting archive size by not dumping empty parts of the file.

    Overwrite control

These options control tar actions when extracting a file over an existing copy on disk.
-k, --keep-old-files
  Don’t replace existing files when extracting.
--keep-newer-files
  Don’t replace existing files that are newer than their archive copies.
--no-overwrite-dir
  Preserve metadata of existing directories.
--one-top-level[=DIR]
  Extract all files into DIR, or, if used without argument, into a subdirectory named by the base name of the archive (minus standard compression suffixes recognizable by --auto-compress).
--overwrite
  Overwrite existing files when extracting.
--overwrite-dir
  Overwrite metadata of existing directories when extracting (default).
--recursive-unlink
  Recursively remove all files in the directory prior to extracting it.
--remove-files
  Remove files from disk after adding them to the archive.
-U, --unlink-first
  Remove each file prior to extracting over it.
-W, --verify
  Verify the archive after writing it.

    Output stream selection

--ignore-command-error
Ignore subprocess exit codes.
--no-ignore-command-error
  Treat non-zero exit codes of children as error (default).
-O, --to-stdout
  Extract files to standard output.
--to-command=COMMAND
  Pipe extracted files to COMMAND. The argument is the pathname of an external program, optionally with command line arguments. The program will be invoked and the contents of the file being extracted supplied to it on its standard output. Additional data will be supplied via the following environment variables:
TAR_FILETYPE
  Type of the file. It is a single letter with the following meaning:


        f           Regular file
        d           Directory
        l           Symbolic link
        h           Hard link
        b           Block device
        c           Character device

Currently only regular files are supported.

TAR_MODE
  File mode, an octal number.
TAR_FILENAME
  The name of the file.
TAR_REALNAME
  Name of the file as stored in the archive.
TAR_UNAME
  Name of the file owner.
TAR_GNAME
  Name of the file owner group.
TAR_ATIME
  Time of last access. It is a decimal number, representing seconds since the Epoch. If the archive provides times with nanosecond precision, the nanoseconds are appended to the timestamp after a decimal point.
TAR_MTIME
  Time of last modification.
TAR_CTIME
  Time of last status change.
TAR_SIZE
  Size of the file.
TAR_UID
  UID of the file owner.
TAR_GID
  GID of the file owner.

Additionally, the following variables contain information about tar operation mode and the archive being processed:
TAR_VERSION
  GNU tar version number.
TAR_ARCHIVE
  The name of the archive tar is processing.
TAR_BLOCKING_FACTOR
  Current blocking factor, i.e. number of 512-byte blocks in a record.
TAR_VOLUME
  Ordinal number of the volume tar is processing (set if reading a multi-volume archive).
TAR_FORMAT
  Format of the archive being processed. One of: gnu, oldgnu, posix, ustar, v7. TAR_SUBCOMMAND A short option (with a leading dash) describing the operation tar is executing.

    Handling of file attributes

--atime-preserve[=METHOD]
  Preserve access times on dumped files, either by restoring the times after reading (METHOD=replace, this is the default) or by not setting the times in the first place (METHOD=system)
--delay-directory-restore
  Delay setting modification times and permissions of extracted directories until the end of extraction. Use this option when extracting from an archive which has unusual member ordering.
--group=NAME
  Force NAME as group for added files.
--mode=CHANGES
  Force symbolic mode CHANGES for added files.
--mtime=DATE-OR-FILE
  Set mtime for added files. DATE-OR-FILE is either a date/time in almost arbitrary formate, or the name of an existing file. In the latter case the mtime of that file will be used.
-m, --touch
  Don’t extract file modified time.
--no-delay-directory-restore
  Cancel the effect of the prior --delay-directory-restore option.
--no-same-owner
  Extract files as yourself (default for ordinary users).
--no-same-permissions
  Apply the user’s umask when extracting permissions from the archive (default for ordinary users).
--numeric-owner
  Always use numbers for user/group names.
--owner=NAME
  Force NAME as owner for added files.
-p, --preserve-permissions, --same-permissions
  extract information about file permissions (default for superuser)
--preserve
  Same as both -p and -s.
--same-owner
  Try extracting files with the same ownership as exists in the archive (default for superuser).
-s, --preserve-order, --same-order
  Sort names to extract to match archive
--sort=ORDER
  When creating an archive, sort directory entries according to ORDER, which is one of none, name, or inode.

The default is --sort=none, which stores archive members in the same order as returned by the operating system.

Using --sort=name ensures the member ordering in the created archive is uniform and reproducible.

Using --sort=inode reduces the number of disk seeks made when creating the archive and thus can considerably speed up archivation. This sorting order is supported only if the underlying system provides the necessary information.

    Device selection and switching

-f, --file=ARCHIVE
  Use archive file or device ARCHIVE. If this option is not given, tar will first examine the environment variable ‘TAPE’. If it is set, its value will be used as the archive name. Otherwise, tar will assume the compiled-in default. The default value can be inspected either using the --show-defaults option, or at the end of the tar --help output.

An archive name that has a colon in it specifies a file or device on a remote machine. The part before the colon is taken as the machine name or IP address, and the part after it as the file or device pathname, e.g.:

--file=remotehost:/dev/sr0

An optional username can be prefixed to the hostname, placing a @ sign between them.

By default, the remote host is accessed via the rsh(1) command. Nowadays it is common to use ssh(1) instead. You can do so by giving the following command line option:

--rsh-command=/usr/bin/ssh

The remote mashine should have the rmt(8) command installed. If its pathname does not match tar’s default, you can inform tar about the correct pathname using the --rmt-command option.

--force-local
  Archive file is local even if it has a colon.
-F, --info-script=COMMAND, --new-volume-script=COMMAND
  Run COMMAND at the end of each tape (implies -M). The command can include arguments. When started, it will inherit tar’s environment plus the following variables:
TAR_VERSION
  GNU tar version number.
TAR_ARCHIVE
  The name of the archive tar is processing.
TAR_BLOCKING_FACTOR
  Current blocking factor, i.e. number of 512-byte blocks in a record.
TAR_VOLUME
  Ordinal number of the volume tar is processing (set if reading a multi-volume archive).
TAR_FORMAT
  Format of the archive being processed. One of: gnu, oldgnu, posix, ustar, v7.
TAR_SUBCOMMAND
  A short option (with a leading dash) describing the operation tar is executing.
TAR_FD File descriptor which can be used to communicate the new volume name to tar.

If the info script fails, tar exits; otherwise, it begins writing the next volume.

-L, --tape-length=
  Change tape after writing Nx1024 bytes. If N is followed by a size suffix (see the subsection Size suffixes below), the suffix specifies the multiplicative factor to be used instead of 1024.

This option implies -M.

-M, --multi-volume
  Create/list/extract multi-volume archive.
--rmt-command=COMMAND
  Use COMMAND instead of rmt when accessing remote archives. See the description of the -f option, above.
--rsh-command=COMMAND
  Use COMMAND instead of rsh when accessing remote archives. See the description of the -f option, above.
--volno-file=FILE
  When this option is used in conjunction with --multi-volume, tar will keep track of which volume of a multi-volume archive it is working in FILE.

    Device blocking

-b, --blocking-factor=BLOCKS
  Set record size to BLOCKSx512 bytes.
-B, --read-full-records
  When listing or extracting, accept incomplete input records after end-of-file marker.
-i, --ignore-zeros
  Ignore zeroed blocks in archive. Normally two consecutive 512-blocks filled with zeroes mean EOF and tar stops reading after encountering them. This option instructs it to read further and is useful when reading archives created with the -A option.
--record-size=NUMBER
  Set record size. NUMBER is the number of bytes per record. It must be multiple of 512. It can can be suffixed with a size suffix, e.g. --record-size=10K, for 10 Kilobytes. See the subsection Size suffixes, for a list of valid suffixes.

    Archive format selection

-H, --format=FORMAT
  Create archive of the given format. Valid formats are:
gnu GNU tar 1.13.x format
oldgnu GNU format as per tar <= 1.12.
pax, posix
  POSIX 1003.1-2001 (pax) format.
ustar POSIX 1003.1-1988 (ustar) format.
v7 Old V7 tar format.
--old-archive, --portability
  Same as --format=v7.
--pax-option=keyword[[:]=value][,keyword[[:]=value]]...
  Control pax keywords when creating PAX archives (-H pax). This option is equivalent to the -o option of the pax(1) utility.
--posix Same as --format=posix.
-V, --label=TEXT
  Create archive with volume name TEXT. If listing or extracting, use TEXT as a globbing pattern for volume name.

    Compression options

-a, --auto-compress
  Use archive suffix to determine the compression program.
-I, --use-compress-program=COMMAND
  Filter data through COMMAND. It must accept the -d option, for decompression. The argument can contain command line options.
-j, --bzip2
  Filter the archive through bzip2(1).
-J, --xz Filter the archive through xz(1).
--lzip Filter the archive through lzip(1).
--lzma Filter the archive through lzma(1).
--lzop Filter the archive through lzop(1).
--no-auto-compress
  Do not use archive suffix to determine the compression program.
-z, --gzip, --gunzip, --ungzip
  Filter the archive through gzip(1).
-Z, --compress, --uncompress
  Filter the archive through compress(1).

    Local file selection

--add-file=FILE
  Add FILE to the archive (useful if its name starts with a dash).
--backup[=CONTROL]
  Backup before removal. The CONTROL argument, if supplied, controls the backup policy. Its valid values are:
none, off
  Never make backups.
t, numbered
  Make numbered backups.
nil, existing
  Make numbered backups if numbered backups exist, simple backups otherwise.
never, simple
  Always make simple backups

If CONTROL is not given, the value is taken from the VERSION_CONTROL environment variable. If it is not set, existing is assumed.

-C, --directory=DIR
  Change to directory DIR.
--exclude=PATTERN
  Exclude files matching PATTERN, a glob(3)-style wildcard pattern.
--exclude-backups
  Exclude backup and lock files.
--exclude-caches
  Exclude contents of directories containing file CACHEDIR.TAG, except for the tag file itself.
--exclude-caches-all
  Exclude directories containing file CACHEDIR.TAG and the file itself.
--exclude-caches-under
  Exclude everything under directories containing CACHEDIR.TAG
--exclude-ignore=FILE
  Before dumping a directory, see if it contains FILE. If so, read exclusion patterns from this file. The patterns affect only the directory itself.
--exclude-ignore-recursive=FILE
  Same as --exclude-ignore, except that patterns from FILE affect both the directory and all its subdirectories.
--exclude-tag=FILE
  Exclude contents of directories containing FILE, except for FILE itself.
--exclude-tag-all=FILE
  Exclude directories containing FILE.
--exclude-tag-under=FILE
  Exclude everything under directories containing FILE.
--exclude-vcs
  Exclude version control system directories.
--exclude-vcs-ignores
  Exclude files that match patterns read from VCS-specific ignore files. Supported files are: .cvsignore, .gitignore, .bzrignore, and .hgignore.
-h, --dereference
  Follow symlinks; archive and dump the files they point to.
--hard-dereference
  Follow hard links; archive and dump the files they refer to.
-K, --starting-file=MEMBER
  Begin at the given member in the archive.
--newer-mtime=DATE
  Work on files whose data changed after the DATE. If DATE starts with / or . it is taken to be a file name; the mtime of that file is used as the date.
--no-null Disable the effect of the previous --null option.
--no-recursion
  Avoid descending automatically in directories.
--no-unquote
  Do not unquote input file or member names.
--null Instruct subsequent -T options to read null-terminated names, disable handling of the -C option read from the file.
-N, --newer=DATE, --after-date=DATE
  Only store files newer than DATE. If DATE starts with / or . it is taken to be a file name; the ctime of that file is used as the date.
--one-file-system
  Stay in local file system when creating archive.
-P, --absolute-names
  Don’t strip leading slashes from file names when creating archives.
--recursion
  Recurse into directories (default).
--suffix=STRING
  Backup before removal, override usual suffix. Default suffix is ~, unless overridden by environment variable SIMPLE_BACKUP_SUFFIX.
-T, --files-from=FILE
  Get names to extract or create from FILE.
--unquote
  Unquote file or member names (default).
-X, --exclude-from=FILE
  Exclude files matching patterns listed in FILE.

    File name transformations

--strip-components=NUMBER
  Strip NUMBER leading components from file names on extraction.
--transform=EXPRESSIONR, --xform=EXPRESSION
  Use sed replace EXPRESSION to transform file names.

    File name matching options

These options affect both exclude and include patterns.
--anchored
  Patterns match file name start.
--ignore-case
  Ignore case.
--no-anchored
  Patterns match after any / (default for exclusion).
--no-ignore-case
  Case sensitive matching (default).
--no-wildcards
  Verbatim string matching.
--no-wildcards-match-slash
  Wildcards do not match /.
--wildcards
  Use wildcards (default for exclusion).
--wildcards-match-slash
  Wildcards match / (default for exclusion).

    Informative output

--checkpoint[=N]
  Display progress messages every Nth record (default 10).
--checkpoint-action=ACTION
  Run ACTION on each checkpoint.
--full-time
  Print file time to its full resolution.
--index-file=FILE
  Send verbose output to FILE.
-l, --check-links
  Print a message if not all links are dumped.
--no-quote-chars=STRING
  Disable quoting for characters from STRING.
--quote-chars=STRING
  Additionally quote characters from STRING.
--quoting-style=STYLE
  Set quoting style for file and member names. Valid values for STYLE are literal, shell, shell-always, c, c-maybe, escape, locale, clocale.
-R, --block-number
  Show block number within archive with each message.
--show-omitted-dirs
  When listing or extracting, list each directory that does not match search criteria.
--show-transformed-names, --show-stored-names
  Show file or archive names after transformation by --strip and --transform options.
--totals[=SIGNAL]
  Print total bytes after processing the archive. If SIGNAL is given, print total bytes when this signal is delivered. Allowed signals are: SIGHUP, SIGQUIT, SIGINT, SIGUSR1, and SIGUSR2. The SIG prefix can be omitted.
--utc Print file modification times in UTC.
-v, --verbose
  Verbosely list files processed.
--warning=KEYWORD
  Enable or disable warning messages identified by KEYWORD. The messages are suppressed if KEYWORD is prefixed with no- and enabled otherwise.

Multiple --warning messages accumulate.

Keywords controlling general tar operation:
all Enable all warning messages. This is the default.
none Disable all warning messages.
filename-with-nuls
  "%s: file name read contains nul character"
alone-zero-block
  "A lone zero block at %s"
Keywords applicable for tar --create:
cachedir
  "%s: contains a cache directory tag %s; %s"
file-shrank
  "%s: File shrank by %s bytes; padding with zeros"
xdev "%s: file is on a different filesystem; not dumped"
file-ignored
  "%s: Unknown file type; file ignored"
"%s: socket ignored"
"%s: door ignored"
file-unchanged
  "%s: file is unchanged; not dumped"
ignore-archive
  "%s: file is the archive; not dumped"
file-removed
  "%s: File removed before we read it"
file-changed
  "%s: file changed as we read it"
Keywords applicable for tar --extract:
timestamp
  "%s: implausibly old time stamp %s"
"%s: time stamp %s is %s s in the future"
contiguous-cast
  "Extracting contiguous files as regular files"
symlink-cast
  "Attempting extraction of symbolic links as hard links"
unknown-cast
  "%s: Unknown file type ’%c’, extracted as normal file"
ignore-newer
  "Current %s is newer or same age"
unknown-keyword
  "Ignoring unknown extended header keyword ’%s’"
decompress-program
  Controls verbose description of failures occurring when trying to run alternative decompressor programs. This warning is disabled by default (unless --verbose is used). A common example of what you can get when using this warning is:

$ tar --warning=decompress-program -x -f archive.Z tar (child): cannot run compress: No such file or directory tar (child): trying gzip

This means that tar first tried to decompress archive.Z using compress, and, when that failed, switched to gzip.

record-size
  "Record size = %lu blocks"
Keywords controlling incremental extraction:
rename-directory
  "%s: Directory has been renamed from %s"
"%s: Directory has been renamed"
new-directory
  "%s: Directory is new"
xdev "%s: directory is on a different device: not purging"
bad-dumpdir
  "Malformed dumpdir: ’X’ never used"

-w, --interactive, --confirmation
  Ask for confirmation for every action.

    Compatibility options

-o When creating, same as --old-archive. When extracting, same as --no-same-owner.

    Size suffixes




        Suffix    Units                   Byte Equivalent
        b         Blocks                  SIZE x 512
        B         Kilobytes               SIZE x 1024
        c         Bytes                   SIZE
        G         Gigabytes               SIZE x 1024^3
        K         Kilobytes               SIZE x 1024
        k         Kilobytes               SIZE x 1024
        M         Megabytes               SIZE x 1024^2
        P         Petabytes               SIZE x 1024^5
        T         Terabytes               SIZE x 1024^4
        w         Words                   SIZE x 2

RETURN VALUE

Tar exit code indicates whether it was able to successfully perform the requested operation, and if not, what kind of error occurred.
0 Successful termination.
1 Some files differ. If tar was invoked with the --compare (--diff, -d) command line option, this means that some files in the archive differ from their disk counterparts. If tar was given one of the --create, --append or --update options, this exit code means that some files were changed while being archived and so the resulting archive does not contain the exact copy of the file set.
2 Fatal error. This means that some fatal, unrecoverable error occurred.
If a subprocess that had been invoked by tar exited with a nonzero exit code, tar itself exits with that code as well. This can happen, for example, if a compression option (e.g. -z) was used and the external compressor program failed. Another example is rmt failure during backup to a remote device.

SEE ALSO

bzip2(1), compress(1), gzip(1), lzma(1), lzop(1), rmt(8), symlink(7), tar(5), xz(1).

Complete tar manual: run info tar or use emacs(1) info mode to read it.

Online copies of GNU tar documentation in various formats can be found at:

http://www.gnu.org/software/tar/manual

BUG REPORTS

Report bugs to <bug-tar@gnu.org>.

COPYRIGHT

Copyright © 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

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TAR TAR (1) February 22, 2014

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