check_mem

#!/bin/bash

# check_mem modified for use on debian stretch

if [ "$1" = "-w" ] && [ "$2" -gt "0" ] && [ "$3" = "-c" ] && [ "$4" -gt "0" ]; then
    memTotal_m=$(awk '$1~/^MemTotal/{print $2}' /proc/meminfo )
    memFree_m=$(awk '$1~/^MemFree/{print $2}' /proc/meminfo )
    memBuffer_m=$(awk '$1~/^Buffers/{print $2}' /proc/meminfo )
    memCache_m=$(awk '$1~/^Cached/{print $2}' /proc/meminfo )

    memUsed_m=$(($memTotal_m-$memFree_m-$memBuffer_m-$memCache_m))
    memUsedPrc=$((($memUsed_m*100)/$memTotal_m))

	warn=$(((($memTotal_m*100)-($memTotal_m*(100-$2)))/100))
	crit=$(((($memTotal_m*100)-($memTotal_m*(100-$4)))/100))

	memTotal_b=$(($memTotal_m*1024))
	memFree_b=$(($memFree_m*1024))
	memUsed_b=$(($memUsed_m*1024))
	memBuffer_b=$(($memBuffer_m*1024))
	memCache_b=$(($memCache_m*1024))

	minmax="0;$memTotal_b";
	data="TOTAL=$memTotal_b;;;$minmax USED=$memUsed_b;$warn;$crit;$minmax CACHE=$memCache_b;;;$minmax BUFFER=$memBuffer_b;;;$minmax"

        if [ "$memUsedPrc" -ge "$4" ]; then
                echo "MEMORY CRITICAL - Total: $memTotal_m KB - Used: $memUsed_m KB - $memUsedPrc% used!|$data"
                $(exit 2)
        elif [ "$memUsedPrc" -ge "$2" ]; then
                echo "MEMORY WARNING - Total: $memTotal_m KB - Used: $memUsed_m KB - $memUsedPrc% used!|$data"
                $(exit 1)
        else
                echo "MEMORY OK - Total: $memTotal_m KB - Used: $memUsed_m KB - $memUsedPrc% used|$data"
                $(exit 0)
        fi

else
        echo "check_mem v1.3"
        echo ""
        echo "Usage:"
        echo "check_mem.sh -w <warnlevel> -c <critlevel>"
        echo ""
        echo "warnlevel and critlevel is percentage value without %"
        echo ""
        echo "v1.1 Copyright (C) 2012 Lukasz Gogolin (lukasz.gogolin@gmail.com)"
        echo "v1.2 Modified 2014 by Aaron Roydhouse (aaron@roydhouse.com)"
        echo "v1.3 Modified 2015 by Aaron Roydhouse (aaron@roydhouse.com)"
        exit
fi