Hi, I'm sort of ashamed that I have to ask this, as a long-time Linux user, but: why the error message below? (Mountain Lion) 'grep' exists and is in $PATH: js-MacBook-Pro:~ j$ grep Usage: grep [OPTION]... PATTERN [FILE]... Try 'grep --help' for more information. But I can't pipe through it: js-MacBook-Pro:~ j$ find . | grep -i jpg -bash: grep: command not found Help appreciated!