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This command will first add an alias known only to git, which will allow you to pull a remote and first-forward the current branch. However, if the remote/branch and your branch have diverged, it will stop before actually trying to merge the two, so you can back out the changes.
Tested on git 22.214.171.124, msysgit (Windows port)
Actually this is not really the way I want it. I want it to attempt a fast-foward, but not attempt to merge or change my working copy. Unfortunately git pull doesn't have that functionality (yet?).
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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