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.  Notice, that newer files don’t replace their old archive copies, but instead
              are appended to the end of archive.  The resulting archive can thus contain several members of the same name, corresponding to various versions of the same file.

       -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, con‐
              sequently, 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.

       --hole-detection=METHOD
              Use METHOD to detect holes in sparse files.  This option implies --sparse.  Valid values for METHOD are seek and raw.  Default is seek with fallback to raw when not applicable.

       -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