Usage: igzip [options] [infiles]

Options:
 -h, --help           help, print this message
 -#                   use compression level # with 0 <= # <= 3
 -o  <file>           output file
 -c, --stdout         write to stdout
 -d, --decompress     decompress file
 -z, --compress       compress file (default)
 -f, --force          overwrite output without prompting
     --rm             remove source files after successful (de)compression
 -k, --keep           keep source files (default)
 -S, --suffix <.suf>  suffix to use while (de)compressing
 -V, --version        show version number
 -v, --verbose        verbose mode
 -N, --name           save/use file name and timestamp in compress/decompress
 -n, --no-name        do not save/use file name and timestamp in compress/decompress
 -t, --test           test compressed file integrity
 -T, --threads <n>    use n threads to compress if enabled
 -q, --quiet          suppress warnings

with no infile, or when infile is - , read standard input