git branch rename master to trunk

gistfile1.txt

# on a local clone when the remote has NOT been updated to the new branch name yet
git checkout master
git branch -m master trunk
git fetch
git branch --unset-upstream
git branch -u origin trunk
git symbolic-ref refs/remotes/origin/HEAD refs/remotes/origin/trunk
# change the DEFAULT BRANCH on GitHub to trunk before pushing or it will reject the push
git push origin --delete master

# on a local clone after the remote repo has been changed
git fetch --all
git checkout trunk
git remote set-head origin trunk
git remote prune origin

# to start a new repository out with only trunk
# simply do the first checkout to create trunk BEFORE committing anything
# only branches with commits are created, so master will never exist
git init
git checkout -b trunk