#Implementing a Shell in C that behaves like bash

when executed it does:
• Print a prompt (# character).
• Read in a line from stdin.
• This line will be a command followed by space separated arguments.
• Execute the command with the given arguments.
• Wait until command completes.
• Print the prompt again and accept more commands.
• Exit when EOF is received (Ctrl+D).

The implemented commands are:

1. ls
2. sleep
3. pwd
4. mkdir
5. cd
6. rmdir
7. echo
8. whoami
9. cat
10. head