du - estimate file space usage.
Display the disk usage of a specific file:
du /home/john/movie.avi
Display the disk usage of a directory in bytes:
du /home/john
Display the disk usage summary of all the files and directories:
du -a /home/john
Display the disk usage of a directory in kilobytes:
du -k /home/john
Display the disk usage of a directory in megabytes:
du -m /home/john
Display the disk usage of a directory in human readable format:
du -h /home/john
Display the disk usage summary of a directory:
du -hs /home/john
Display the disk usage grand total:
du -hc /home/john
Display the disk usage of a directory excluding some file types:
du -ah --exclude="*.mp3" /home/john
Display the disk usage based on modification of time:
du -ah --time /home/john