Syncs upstream branch with local branch

sync.sh

#!/bin/bash
if [ -d ".git" ]; then
  echo "git repo detected"
  echo "checking out $1..."
  git checkout $1
  echo "fetching origin $1..."
  git fetch origin $1
  echo "merging origin $1 to local $1..."
  git merge origin/$1
  echo "done"
else
  echo "no git repo detected"
fi