Well I'm a Mac Noobie but I know some UNIX console commands, I was trying Zend Framework with MAC OS 10.5.8, I got stuck when I'm trying to find the bash_profile thing...

open ~/.bash_profile

to add some alias

alias zf=/usr/local/ZendFrameworkClient/bin/zf.sh

so I tried to use grep with profile keyword to search "ls -a ~/ | grep profile" and it shows this file .profile so I tried to edit it and add the alias for zend command, and it work perfectly.