Shell Programming and Scripting

#!/bin/bash


cron=$(ps aux | grep crond | grep -v  grep  | grep -o crond| uniq)
echo "cron :$cron:"

if [ "$cron" = "crond" ]; then
        echo "OK: crond service running fine on `hostname`"
        exit 2
else
        echo "CRITICAL: crond service not running on `hostname`"
        exit 0
fi

# sh  /root/aron/check_crond
cron :crond:
OK: crond service running fine on hostname

root@server [~]# cron=`ps aux | grep crond | grep -v  grep  | grep -o crond| uniq | sed '/^$/d'` ; echo $cron

root@server [~]#

/root/aron/check_crond

grep -v sh