Enable and disable nginx sites

ng

#!/bin/bash

function usage {
  echo "Manage nginx sites"
  echo
  echo "Usage:"
  echo
  echo "ng pull"
  echo "ng push"
  echo "ng list"
  echo "ng list-enabled"
  echo "ng enable <site>"
  echo "ng disable <site>"
  exit 1
}

if [ "$#" -lt "1" ]; then 
  usage 
fi

op=$1
shift 1

case "$op" in
pull)
  git -C /home/mars/nginx-dg pull
  ;;
push)
  git -C /home/mars/nginx-dg add .
  git -C /home/mars/nginx-dg commit
  git -C /home/mars/nginx-dg push
  ;;
list) 
  ls /etc/nginx/sites-available
  ;;
list-enabled)
  ls /etc/nginx/sites-enabled
  ;;
enable)
  site=$1
  if [ ! -f "/etc/nginx/sites-available/$site" ]; then
    echo "No such site \"$site\""
    exit 1
  fi
  sudo ln -s /etc/nginx/sites-available/$site /etc/nginx/sites-enabled/$site
  sudo service nginx reload
  ;;
disable)
  site=$1
  if [ ! -f "/etc/nginx/sites-enabled/$site" ]; then
    echo "No such enabled site \"$site\""
    exit 1
  fi
  sudo rm /etc/nginx/sites-enabled/$site
  sudo service nginx reload
  ;;
*)
  usage
  ;;
esac