#!/usr/bin/env bash

# Author: Ruben Blanco

mLine=`free | awk 'NR==2'`
mTotal=`echo $mLine| awk '{print $2}'`
mFree=`echo $mLine| awk '{print $4}'`
mUsed=`echo $mLine| awk '{print $3}'`

nagios_func(){
    echo "$1 Memory Usage=$mUsed, From $mTotal | free_mem=$mFree;;; used_mem=$mUsed;4555555;9837470;";
}

nagios_unknown(){
    echo "$1 No value as Argument";
}

if [[ "$#" -eq 0 ]]
then
    nagios_unknown "UNKNOWN"; exit 3;
elif [[ $mUsed -gt $2 ]]
then
    nagios_func "CRITICAL"; exit 2;
elif [[ $mUsed -gt $1 ]]
then
    nagios_func "WARNING"; exit 1;
else
    nagios_func "OK"; exit 0;
fi