bzip2
Linux Commands - Managing Backups

bzip2

This command will compress a file with the Burrows-Wheeler block-sorting text-compression algorithm. It works much like gzip but with smaller archives.

Options -d decompress --decompress decompress -z compress --compress compress -t test compression without creating a compressed file --test test compression without creating a compressed file -k keep input files --keep keep input files -s reduce memory usage --small reduce memory usage

Notice that there are two dashes in front of the options that are words!