The command gzip can be used to compress files in order to save space. For example:
gzip *.data
compresses all files with extension .data in the current directory. The gzip command is often combined with tar by using the z option to tar. So we can use:
tar czvf cs253.tar.gz cs253
to create a tarball that is also compressed. The convention is to name the compressed tarball with the extension .tar.gz. To unpack a compressed tarball, we would use the z option as well. For example:
tar xzvf cs253.tar.gz