删除已经提交的ignore file

To untrack a single file that has already been added/initialized to your repository, i.e., stop tracking the file but not delete it from your system use:

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git rm --cached filename

To untrack every file that is now in your .gitignore:

First commit any outstanding code changes, and then, run this command:

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git rm -r --cached .

This removes any changed files from the index(staging area), then just run:

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git add .

Commit it:

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git commit -m ".gitignore is now working"