i am stuck with rbash ,came out of it but still do not know wheather i am in the correct direction ,after coming out iam able to travese here and there but every command i type ,the shell says 'command not available'
please direct me in the right direction.

Read on other shells, figure it out. It seems like you have asked a question on the forums every time you get a little stumped. try and figure out the underlying technology, what it it does, and how you can overcome it.

Hint: "Perl" is available to you. Maybe you should look into how you would read from the filesystem with Perl? ;-)