du - print disk usage
du [-as] [-l n] dir ...
-a Give usage for all files
-l List up to n levels of subdirectories
-s Summary only
du dir # List disk space used by files in dir
du -s dir1 dir2 # Give summaries only
Du examines one or more directories and prints the amount of space
occupied by the files in those directories and their subdirectories.
df(1).