creationix/nvm — pull request #563 by reubano (2014-10-29 05:46:04+00:00)
Title: Ignore aliases (fixes #536)

A better solution would be to see if the installed `sha1` supports the `-q` option and use a fallback command if it doesn't. But this way, if you create a `sha1` alias on mac, nvm will at least install node.