undo last push to github code example

Example 1: github cancel last push

# to undo a git push
git push -f origin HEAD^:master

# to get to previous commit (preserves working tree)
git reset --soft HEAD

# to get back to previous commit (you'll lose working tree)
git reset --hard HEAD^

Example 2: github undo last pushed commit

git reset <previous label or sha1>
git commit -am "blabla"
git push -f <remote-name> <branch-name>