ansible/ansible — pull request #2141 by dorfsmay (2013-02-20 08:25:13+00:00)
Title: Prevents PATH, PYTHONPATH etc... to be re-added.

With the current version, every time you run env-setup, it adds to the PATH, PYTHONPATH and MANPATH. I find myself often re-running env-setup, as I am not always sure I used ansible from a given terminal/session. This simple change only add to the PATHs if they aren't set already.