The git stash command is used to store changes to a dirty git tree when pulling changes[ref]http://man.github.com/git/git-stash.html[/ref].
For example, if you are working on a repository, but are not ready to commit your changes, you may run.
This will store the changes you have made since the last revision and allow you to start back fresh at the point of your last commit.
Once you are done, you may run
git stash pip
That will restore your repository back to where you were when you ran