How to check which directory used up most of the disk space?

How to check which directory used up most of the disk space?

Answer:

For example, assume you are at /usr/local, you want to generate a report on disk space usage on all the sub directories, you can use the following command

# du -k * | sort -n

.
.
14564   share/man/man3
14816   share/man
16624   share/perl/5.10.0
16628   share/perl
33060   share

It will give you a very clear and useful report.