I know this is a common post out there, as a google search will bring this up multiple times, but here it is anyway. A great alias to set up on your system to aid in finding space hogs in a given filesystem or directory is as follows:
alias ducks=’du -cks * |sort -rn |head -11′
Add the aliases to whichever file you keep them in (.bashrc, .aliases, etc) and then run ‘ducks’ for output similar to this:
194585312 total
36280896 dvd
32974872 Documents
21518768 Security
17339104 Sources
16323048 subversion
14843748 music
Clean, and simple!