Use the du command to list firectories with largest disk space. Replace DIREC in the following commands with a starting directory (e.g; / or /etc)
# du -sh $DIREC/* | sort -r --human-numeric-sort | head -n10
In the above command, head -n10 option can be changed to list few or more results in the output.
Another example is given below.
# du -sh /* | sort -r --human-numeric-sort | head -n10