See program occupies more space in Ubuntu

I encounter a strange command to see Ubuntu programs which are occupying more space. And that is that? As a curious and perhaps also some discover that they have a heavy agenda and could no longer use uninstall and save disk space

The command is this:
dpkg-query --show --showformat='${Package;-50}\t${Installed-Size}\n' | sort -k 2 -n | grep -v deinstall | awk '{printf "%.3f MB \t %s\n",$2/(1024)