How To Change A File Back To A Previous Commit

Assume you unintentionally made changes to a file a few commits ago. To revert it to an earlier file version, i.e. commit, you can first list the version history of said file.

$ git log --oneline <file>

Once you know which version to revert your file back to, pick its commit hash (e.g. 902744c) and run the following command:

$ git checkout <commit hash> -- <file>

Then stage and commit the changes.