du (display disk usage)

Displays the amount of disk space used by a directory and each subdirectory.

 Format:    du directory_name Examples:  du            du /home/janet 

If the directory named is omitted, the current directory is used. The size is displayed as the number of KB blocks.

Opt	What It Does	Example
-a	List all files, not just subdirectories	du -a
-b	Display size in bytes	du -b
-c	Display grand total	du -c
-m	Display size in megabytes	du -m
-s	Display only the grand total	du -s