#! /bin/sh -x
# List ways to get the current branch name.
# Compare the output after "git checkout master" and "git checkout master~1".

git branch --show-current
git describe --all
git name-rev --name-only HEAD

git rev-parse --abbrev-ref HEAD
git rev-parse --symbolic-full-name --abbrev-ref HEAD

git symbolic-ref --short -q HEAD; echo $?
git symbolic-ref --short HEAD
git symbolic-ref HEAD