Ever get tired of having to type out branch names when you're trying to switch between local branches? This four line function will prompt you for a number instead (warning: uses zsh function and 'read' builtin syntax; you'll need to modify for bash).

co.sh

# "checkout". Shows you local git branches and prompts you to select one by ordinal
co() {
   echo "Which branch do you want to switch to?"
   git branch | cat -n
   read "NUM?> "
   git checkout $(git branch | head -n $NUM | tail -n 1)
}