What is the easiest way to find where my disk space is being taken up? On one of
my servers I have three partitions: /, /var, and /boot. I used `df` to show me
how much space I have left and I find my root partition is almost full. What is
the easiest way to find out what directories contain the most data similar to
the way df displays partition consumption. I need to hunt down and figure out
what files are growing off the root and move them somewhere else.

Thanks. -Jeremy