If you're on a Mac, you'll need to install gawk (at least I did on 10.7). Probably the easiest way to do this is with homebrew[1]: brew install gawk [1]

If you're on a Mac, you'll need to install gawk (at least I did on 10.7). Probably the easiest way to do this is with homebrew[1]: brew install gawk [1] If you don't know about homebrew, check out https://github.com/mxcl/homebrew https://github.com/mxcl/homebrew. It's a package manager for Mac.