Nagios and Exim queue size

A simple script to check Exim queue size for Nagios NRPE:

#!/bin/bash
#arg1 = warning count
#arg2 = critical count
if [ -z "$1" ] || [ -z "$2" ]
then
        echo "Usage: ${0} warningcount criticalcount"
else
        if [ "$1" -ge "$2" ] || [ "$1" -le "0" ] || [ "$2" -le "0" ]
        then
                echo "Error: incorrect values."
        else
                queuesize=$(/usr/sbin/exim4 -bpc)
                if [ "$queuesize" -gt "$2" ]
                then
                        echo "CRITICAL - exim queue size: $queuesize"
                        exit 2
                elif [ "$queuesize" -gt "$1" ]
                then
                        echo "WARNING - exim queue size: $queuesize"
                        exit 1
                else
                        echo "OK - exim queuesize: $queuesize"
                        exit 0
                fi
        fi
fi
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