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#!/bin/bash

export PATH=$PATH:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
                                          
parameter_measured=free_and_cached_memory;

total_ram=$(echo "($(grep ^MemTotal /proc/meminfo | awk '{print $2}')/1024)" | bc);
free_ram=$(echo "($(grep ^MemFree /proc/meminfo | awk '{print $2}')/1024)" | bc);
cached_ram=$(echo "($(grep ^Cached /proc/meminfo | awk '{print $2}')/1024)" | bc);
available_ram=$(( $free_ram + $cached_ram ));
used_ram=$(( $total_ram - $available_ram ));
ram_usage_percentage=$(echo "($used_ram*100)/$total_ram" | bc );

display_message="$parameter_measured = $available_ram MB";

critical_trigger_value=100;

which bc >/dev/null 2>&1
if [ $? -eq 0 ]
then

if [ $available_ram -le $critical_trigger_value ]
then
printf "$parameter_measured CRITICAL - $display_message" 
printf '|' 
printf "$parameter_measured=$available_ram"MB";;;; ";
printf "free_ram=$free_ram"MB";;;; ";
printf "cached_ram=$cached_ram"MB";;;; ";
echo -n "ram_usage_percentage=$ram_usage_percentage%;;;; ";
exit 2;

else
printf "$parameter_measured OK - $display_message" 
printf '|' 
printf "$parameter_measured=$available_ram"MB";;;; ";
printf "free_ram=$free_ram"MB";;;; ";
printf "cached_ram=$cached_ram"MB";;;; ";
echo -n "ram_usage_percentage=$ram_usage_percentage%;;;; ";
exit 0;
fi

else

printf "$parameter_measured CRITICAL - bc command required for monitoring is missing"
printf '|'
printf "$parameter_measured=0;;;; ";
exit 2;