rzip --version (return code: 0)
rzip version 2.1
rzip -HELP (return code: 255)
rzip 2.1
Copright (C) Andrew Tridgell 1998-2003
usage: rzip [options] <file...>
Options:
-0, --worst fastest (worst) compression
-6 default compression level
-9, --best slowest (best) compression
-d, --decompress decompress
-f, --force force overwrite of any existing files
-o, --output FILENAME specify the output file name
-k, --keep keep existing files
-L, --level LEVEL set compression level
-P, --progress show compression progress
-S, --suffix SUFFIX specify compressed suffix (default '.rz')
-v, --verbose increase verbosity
-V, --version show version
note that rzip cannot operate on stdin/stdout