Originally posted by Scruff
....Might I add using -h for a more readable format? (du -h / | etc... will display a more readable format using mb's for filesize rather than bytes)
Also, if you want to see what you may have in the way of large files, and not just directories, you can use the -a switch along with the -h switch, which can be combined into -ah:
du -ah / | sort -n | tail -n 25 | sort -nr
This will list files and directories using sizes other than bytes.