filipechagas · August 26, 2020 18:32 · Aug 26, 2020
diff --git a/git-filter-branch.md b/git-filter-branch.md
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+# Git filter-branch
+
+So today I noticed my git repository was taking too much disk space and discovered it was due to bundler caching gems. 
+At first I thought I'd just remove `vendor/cache` directory it be done with it. But that's not how git works, is it?
+
+That's how I came across `git filter-branch`.
+
+The following command will remove the `vendor/cache` directory and all its references throughout your repository history.
+
+`git filter-branch --force --index-filter "git rm --cached --ignore-unmatch -r vendor/cache"`
+
+## Undoing it
+
+And, should you realise you shouldn't have done that, git is also there for you. Whenever you use `filter-branch`, git creates a backup of the previous state for you at `.git/refs/original/refs/heads/NAME_OF_YOUR_BRANCH`.
+Meaning all you have to do is run:
+
+`git reset --hard refs/original/refs/heads/NAME_OF_YOUR_BRANCH`
+
+You're welcome ;)