[PD] [OT] OSX command lines

[derek holzer]

I've been trying to help a friend install Pd/PDP and other free software 
under OSX, but I keep running into small differences in syntax between 
Linux and the BSD layer of OSX. Some things, like "find" or "locate", 
just don't function the way I am used to!

Is there a good primer on OSX shell commands online somewhere?
One that would be good for experienced Linux users like myself, as well 
as shell-newbies like my friend?

thx + best,
d.