Fixing a past commit

To add some code changes to a past commit you can commit with the fixup option and then rebase it.

# add the code changes you want to add to the past commit
git add .

# get the git commit you want to add the changes and copy its reference
git log

# commit the changes with the options `fixup`
git commit --fixup <COMMIT_REF>

# rebase the commits to apply the fixup from one commit before the starter commit
git rebase -i --autosquash <COMMIT_REF>~1

This will open your editor (vim) with the rebase plan, so you can apply it.

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