Deletes a branch if master has it's changes

del_merged_branch.sh

if [ -z $1 ]; then echo "Specify branch name"; exit; fi
git checkout master
git pull origin master
git checkout $1
git merge master
git checkout master
out=`git diff master $1`
if [ -z "$out" ]; then
    git branch -D $1
else
    echo 'Diff not empty'
fi