#!/bin/bash

if [ "$1" = "-w" ] && [ "$2" -gt "0" ] && [ "$3" = "-c" ] && [ "$4" -gt "0" ]; then

        memTotal_b=`free -b |grep Mem |awk '{print $2}'`
        memFree_b=`free -b |grep Mem |awk '{print $4}'`
        memBuffer_b=`free -b |grep Mem |awk '{print $6}'`
        memCache_b=`free -b |grep Mem |awk '{print $7}'`

        memTotal_m=`free -m |grep Mem |awk '{print $2}'`
        memFree_m=`free -m |grep Mem |awk '{print $4}'`
        memBuffer_m=`free -m |grep Mem |awk '{print $6}'`
        memCache_m=`free -m |grep Mem |awk '{print $7}'`

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

        memUsedPrc=$((($memUsed_b*100)/$memTotal_b))


        if [ "$memUsedPrc" -ge "$4" ]; then
                echo "Memory: CRITICAL Total: $memTotal_m MB - Used: $memUsed_m MB - $memUsedPrc% used!|TOTAL=$memTotal_b;;;; USED=$memUsed_b;;;; CACHE=$memCache_b;;;; BUFFER=$memBuffer_b;;;;"
                $(exit 2)
        elif [ "$memUsedPrc" -ge "$2" ]; then
                echo "Memory: WARNING Total: $memTotal_m MB - Used: $memUsed_m MB - $memUsedPrc% used!|TOTAL=$memTotal_b;;;; USED=$memUsed_b;;;; CACHE=$memCache_b;;;; BUFFER=$memBuffer_b;;;;"
                $(exit 1)
        else
                echo "Memory: OK Total: $memTotal_m MB - Used: $memUsed_m MB - $memUsedPrc% used|TOTAL=$memTotal_b;;;; USED=$memUsed_b;;;; CACHE=$memCache_b;;;; BUFFER=$memBuffer_b;;;;"
                $(exit 0)
        fi

else
        echo "check_mem v1.1"
        echo ""
        echo "Usage:"
        echo "check_mem.sh -w <warnlevel> -c <critlevel>"
        echo ""
        echo "warnlevel and critlevel is percentage value without %"
        echo ""
"check_mem" 42L, 1767C                                                                                                                                1,1           Top