Shell - How to find directory of some command?

Question

I know that when you are on shell, the only commands that can be used are the ones that can be found on some directory set on PATH. Even I don\'t know how to see what dirs a

Answer 1

The Korn shell, ksh, offers the whence built-in, which identifies other shell built-ins, macros, etc. The which command is more portable, however.