How can I get the current disk usage (in %) of my hard drive from the command line?
By using the
Here's an example output:
Also take a look at its manpage.
ncdu works well from the command line. It's ncurses-based and interactive.
If you want more fine grained disk usage, you should take a look at the answers to http://superuser.com/questions/12611/finding-whats-using-all-the-space-in-nix/604730#604730