mxcl/homebrew — pull request #8142 by d00gs (2011-10-16 10:23:21+00:00)
Title: brew command: exit with nonzero status for unknown command name

`brew` should have an error exit status when you mistype the command name. I'm assuming 1 is the thing to use, since I don't see more distinguishing than error/non-error/interrupt going on.