nginx enable/disable sites

nginx-site.sh

#!/bin/bash

SITES_AVAILABLE_DIR=/etc/nginx/sites-available
SITES_ENABLED_DIR=/etc/nginx/sites-enabled

function print_usage() {
  echo "nginx-site -e <site name> to enable"
  echo "nginx-site -d <site name> to disable"
}

if [ $# -ne 2 ]; then
  print_usage
  exit 1
elif [ $1 != "-e" ] && [ $1 != "-d" ]; then
  print_usage
  exit 1
else
  SITE_AVAILABLE="$SITES_AVAILABLE_DIR/$2"
  SITE_ENABLED="$SITES_ENABLED_DIR/$2"
fi

if [ $1 == "-e" ]; then
  if [ ! -e $SITE_AVAILABLE ]; then
    echo "$2 does not exist."
    exit 0
  fi
  
  if [ -h $SITE_ENABLED ]; then
    echo "$2 is already enabled."
    exit 0
  else
    ln -s $SITE_AVAILABLE $SITE_ENABLED
    echo "$2 has been enabled. Restart nginx."
  fi
fi

if [ $1 == "-d" ]; then
  if [ ! -h $SITE_ENABLED ]; then
    echo "$2 is not enabled."
    exit 0
  else
    rm $SITE_ENABLED
    echo "$2 has been disabled. Restart nginx."
  fi
fi