The less common way of compressing files is using bzip2.
Like with gzip, the syntax is
$ bzip2 fileA fileB...
Using bzip2 adds the extension .bz2.
To uncompress a .bz2 file, you can use the bunzip2 command.
$ bzip2 fileA.bz2 fileB.bz2...
If you want to use this command to zip or unzip every .bz2 file in your
directory, use a wildcard.
$ bzip2 *
$ bunzip2 *