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Usage: xar -[ctx][v] -f <archive> ...
        -c               Creates an archive
        -x               Extracts an archive
        -t               Lists an archive
        -f <filename>    Specifies an archive to operate on [REQUIRED!]
        -v               Print filenames as they are archived
        -n name          Provides a name for a subdocument
        -s <filename>    On extract, specifies the file to extract
                              subdocuments to.
                         On archival, specifies an xml file to add
                              as a subdocument.
        -l               On archival, stay on the local device.
        -p               On extract, set ownership based on symbolic
                              names, if possible.
        -P               On extract, set ownership based on uid/gid.
        --toc-cksum      Specifies the hashing algorithm to use for
                              xml header verification.
                              Valid values: none, sha1, and md5
                              Default: sha1
        --dump-toc=<filename> Has xar dump the xml header into the
                              specified file.
        --dump-header    Prints out the xar binary header information
        --compression    Specifies the compression type to use.
                              Valid values: none, gzip, bzip2
                              Default: gzip
        --list-subdocs   List the subdocuments in the xml header
        --extract-subdoc=name Extracts the specified subdocument
                              to a document in cwd named <name>.xml
        --exclude        POSIX regular expression of files to
                              ignore while archiving.
        --rsize          Specifies the size of the buffer used
                              for read IO operations in bytes.
        --coalesce-heap  When archived files are identical, only store one copy
                              This option creates an archive which
                              is not streamable
        --link-same      Hardlink identical files
        --no-compress    POSIX regular expression of files
                              not to archive, but not compress.
        --version        Print xar's version number