Find the path of a shell command

[Paulo da Silva]

Hi!

The simple question: How do I find the full path of a shell command 
(linux), i.e. how do I obtain the corresponding of, for example,
"type rm" in command line?

The reason:
I have python program that launches a detached rm. It works pretty well 
until it is invoked by cron! I suspect that for cron we need to specify 
the full path.
Of course I can hardcode /usr/bin/rm. But, is rm always in /usr/bin? 
What about other commands?

Thanks for any comments/responses.
Paulo