I have made the same change to several files in a Git repository. I created a commit for each file and submitted it to Github. In this case, one commit would have been sufficient. Now how can I merge the relevant commits into one commit afterwards?
First, run git rebase -i HEAD~X in the local working directory. Instead of X, enter the number of the latest commits you want to merge.
Now an editor should open automatically and in the first lines you should find, for example, the following.
pick 67426ab Commit-Message pick 56432tz Commit-Message pick 45643io Commit-Message
To make one commit out of these three, replace the pick in lines 2 and 3 with squash. The “pick” in the first line remains unchanged. Finally, save the file.
Now an editor should be reopened in which you can adjust the commit message if necessary. Because I used the same message for all three commits, I did not make any changes.
Finally, run git push –force origin HEAD to send the changes to Github. If you used a different alias for the repository (origin is the default) you have to change the command accordingly. If you are not sure, you can check the config file in the .git directory in your local working directory.
If you are not the only person making changes to the files, it is better to use –force-with-lease instead of –force.
If you now look at the history of the repository, the relevant commits have been combined into one commit.