robbyrussell/oh-my-zsh — pull request #920 by adamesque (2012-02-06 18:26:01+00:00)
Title: Write the update file even if `CLOBBER` is unset.

My zsh-update was always erroring out with the following:

_update_zsh_update:1: file exists: /Path/To/Home/.zsh-update

This fixes that by force-opening `.zsh-update` with `>!` instead of `>`.