OT: bash question

[Mike Wright]

Hi all,

Not sure where to find the answer to this question.  Google wasn't 
helpful.  The users on this list are a great repository of knowledge so 
I thought to try here.

Is there a bash command that tells an executing script what *its* path 
is?  Not the path where the user is but where the script is.  If not 
that then a series of commands that yield the same result?  Maybe some 
way of using 'ps'?

Has me stumped and my dog-eared "UNIX in a Nutshell" hasn't exposed the 
goodies either ;)

TIA,
Mike Wright