git commands to cleanly sync a fork with the original repo without dirtying up the commit history with pull requests

sync github repo

git remote add upstream /url/to/original/repo
git fetch upstream
git checkout master     # only needed if not already in master
git rebase upstream/master  
git push

also,
git push --tags    # to sync tags/releases


*To forcibly sync your fork*
doing this may affect commit history and create conflicts of forks of your repo

git remote add upstream /url/to/original/repo
git fetch upstream
git checkout master     #only needed if not already in master
git reset --hard upstream/master  
git push origin master --force

replace "master" with each branch name that needs to be synced and repeat as needed
the result will be a forked branch even with the original branch

*warning*
any changes made ahead of the original branch will be lost