Report file system disk space usage in a human-readable format
$ df -H
sample outputs:
Estimate file space usage in a human-readable format
$ du -H
sample outputs:
How to get the total size of a directory
$ du -hs /path/to/directory
sample outputs:
List directory contents
$ ls -a
sample outputs:
Find the Ubuntu Linux distribution version and related information
$ lsb_release -a
sample outputs: