#!/bin/bash
# check WP Version

wp_new=`curl -s -Lk https://wordpress.org/download/ 2>/dev/null | grep -o -P '(?<=Download&nbsp;WordPress&nbsp;).*(?=</strong>)'`
wp_local=`curl -s -Lk $1 2>/dev/null | grep -o -P '(?<="WordPress ).*(?=" />)'`

# Nagios exit code

ST_OK=0
ST_WR=1
ST_CR=2
ST_UK=3

if [ "$wp_new" == "" ] || [ "$wp_local" == "" ] ; then
        echo "UNKNOW - curl command failed or $1 not available"
        exit $ST_UK
fi

if [ "$wp_new" == "$wp_local" ]; then
        echo "OK -  Wordpress is updated ($wp_local)."
        exit $ST_OK
fi

if [ "$wp_new" != "$wp_local" ]; then
        echo "WARNING - WordPress (Version $wp_new) is available. Current Version $wp_local"
        exit $ST_WR
fi