GIT Checkout Loop

#!/usr/bin/env bash



while true
do
 git fetch --prune; 
        git branch -vvv
 echo "provide branch name to checkout:"
 read branch
        git checkout $branch;
        git pull;
        git log --decorate --pretty=tformat:'%h %d %ar %s' --first-parent --reverse -30;
        git log -1
 $1  # arg to import a command, such as 'exit'
done