SHELL

edit last commit message

git commit --amend -m "New commit message."

git edit last commit message

# with file changes
git commit --amend -m "Commit Message"

# without file changes, update only commit message
git commit --amend -m "Updated Commit Message" --no-edit

git amend last commit message

$ git commit --amend -m "New and correct message"

github change last commit message

# for the most recent commit
git commit --amend -m "changed commits"
git push -f
# for n older commits
git rebase -i HEAD~n
# follow instuctions e.g. use r for reword to edit older commits
# removing a line means THAT COMMIT WILL BE LOST. 
git rebase --continue
# solve conflicts if exist
git push -f
# git push --force-with-lease origin <branch> is safer

git modify last commit but leave the commit message

git add . 
git commit --amend --no-edit