zgz --version (return code: 0)
zgz 20100613 based on NetBSD gzip 20060927, GNU gzip 1.3.12, and bzip2 0.9.5d
zgz --help (return code: 0)
zgz 20100613 based on NetBSD gzip 20060927, GNU gzip 1.3.12, and bzip2 0.9.5d
usage: zgz [-123456789acdfhF:GLNnMmqRrT:Vo:k:s:ZOSP] < <file> > <file>
-G --gnu use GNU gzip implementation
-Z --zlib use zlib's implementation (default)
-O --old-bzip2 generate bzip2 (0.9.5d) output
-S --suse-bzip2 generate suse bzip2 output
-P --suse-pbzip2 generate suse pbzip2 output
-1 --fast fastest (worst) compression
-2 .. -8 set compression level
-9 --best best (slowest) compression
-f --force force writing compressed data to a terminal
-N --name save or restore original file name and time stamp
-n --no-name don't save original file name or time stamp
-m --no-timestamp don't save original time stamp
-M --force-timestemp save the timestamp even if -n was passed
-q --quiet output no warnings
-V --version display program version
-h --help display this help
-o NAME
--original-name NAME use NAME as the original file name
-F NAME --filename NAME same as --original-name
-s --osflag set the OS flag to something different than 03 (Unix)
-T --timestamp SECONDS set the timestamp to the specified number of seconds
gnu-specific options:
-R --rsyncable make rsync-friendly archive
-r --new-rsyncable make rsync-friendly archive (new version)
zlib-specific options:
-k --quirk QUIRK enable a format quirk (buggy-bsd, ntfs, perl)