You might have seen our post last year on Gitifier, the Git commit notifier for OSX. If you prefer something a bit more *nix-y, check out git-dude from Marcin Kulik. Git-dude is a command line utility that monitors Git repos and provides desktop notifications using Growl on OSX or libnotify on Linux.
Configuration is done in the standard Git way:
git config --global dude.interval 30 git config --global dude.icon ~/.git-dude/github_32.png
Check the README for installation and advanced usage.
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