Exclude a file from a git commit

I need to do this about once a week.

git update-index --assume-unchanged path/to/file.txt

git commit -a -m "MOBILE-1234: changed a bunch of files but excluded that one I'm saving for later."

git update-index --no-assume-unchanged path/to/file.txt

If you change 10 files but you only want to commit 9 this will do the trick.

TODO: Complete this git tutorial that blew up on HN a while back. http://pcottle.github.com/learnGitBranching/