i\'m running mongo 1.8.2 and trying to see how to cleanly shut it down on Mac.
on our ubuntu servers i can shutdown mongo cleanly from the mongo shell with:
This is an old question, but its one I found while searching as well.
If you installed with brew then the solution would actually be the this:
brew
launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.mongodb.plist