[git] How to make Git "forget" about a file that was tracked but is now in .gitignore?

git update-index does the job for me:

git update-index --assume-unchanged <file>

Note: This solution is actually independent on .gitignore as gitignore is only for untracked files.


Update, a better option

Since this answer was posted, a new option has been created and that should be preferred. You should use --skip-worktree which is for modified tracked files that the user don't want to commit anymore and keep --assume-unchanged for performance to prevent git to check status of big tracked files. See https://stackoverflow.com/a/13631525/717372 for more details...

git update-index --skip-worktree <file>

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