OK im trying to use crypy command,theres a man page for it,but when I try to use the command iit outputs crypt command not found,or is my syntax just wrong...
Check the man page again. What does it really say?
And how are you trying to use it?
Edit: Didn't intend for it to sound so much like "RTFM", but considering the lack of information I'll keep it anyway. The problem is most likely trying to use something that's not a command as a command...
If you type "man crypt", it says "CRYPT(3)" which means that the page you see is from the section 3.
One can request man pages for other sections, for example by typing "man 1 crypt" instead. (In this case, no entry in section 1 exists). A better example would be "man printf", "man 1 printf" and "man 3 printf".