Show

In a Git repo, show a summary of GitHub users (using author names) and the number of commits by each, sorted by commit count.

$ git shortlog -n -s
   969  michaelcurrin
   123  MichaelCurrin
   116  Alessio Benvenuti

For more info, see the shortlog command.

Edit

Change the author of a commit.

Edit one commit

If you just want to change the most recent commit, a rebase is not necessary. Just amend the commit:

$ git commit --amend --no-edit --reset-author

Edit range of commits by hand

How to update one commit at a time, using Git manually one command at a time.

Note that this convenient for fixing a handful of commits, but is inefficient for changing a lot of commits.

  1. Set your new author name and email in a variable. e.g. 
     $ export AUTHOR="John Doe <john@doe.org>"
  2. Start a rebase, starting with one commit before the first commit you want to update. 
     $ git rebase -i -p COMMIT_REFERENCE

    e.g. use the carat and the target first commit to get one commit before it.

     $ git rebase -i -p fd27b00ac^
  3. Change pick to edit or e for each commit where you want to change the author. Warning - this will replace the author regardless of who it was.
  4. Save the content in the editor view then exit.
  5. Now you adjust each commit one at a time with these two commands: 
    $ git commit --amend --author="$AUTHOR" --no-edit
$ git rebase --continue

Bulk editing

Replace the author across the history of commits, using a single command.

See MichaelCurrin/rewrite-git-author repo.