- finding commands
	- built-in commands
- builtins:
	x echo		(with option -n)
	x cd [path]
	x pwd		(with no options)
	- export	(with no options)
	- unset		(with no options)
	x env		(with no options or arguments)
	x exit		(with no options)
- fix
	- the builtins should get all arguments and check if they're good
	- `$ cat` then ^C

(unnecessary part)
- working history (rl_* functions?)
	- '<<' with history?

(also search TODO and FIXME in the files)
(also check if it works at the cluster (might need libreadline-dev))