amazon web services - Automate snapshots in AWS -

i found thread automating linux ebs snapshots backup , clean-up sergey romanov has given step-by-step instruction. tested , works great. (thanks, surgey.)

the cron entry used * 23 * * * /usr/local/ec2/backup.php

however have problem adding cron job (last step). got error crond[478]: (cron) bad command (/etc/crontab). fix it, added username (root) after error did not appear.

the updated cron entry * 23 * * * root /usr/local/ec2/backup.php

however, job still not running. there did wrong?

thanks