I have set up a cron job on a Centos server that is supposed to execute a script that looks for SMS messages in a queue and processes them. My crontab file is under /etc/crontab. The job is supposed to be run after every 5 minutes. The command I have added to the crontab file is 01 * * * * root /usr/local/bin/readsms.pl to make it run after every minute. However, when I look at the cron log, the job is running after every one hour. Please help me figure out whether its my command that is wrong because as I understand it the command 01 * * * * root /usr/local/bin/readsms.pl is supposed to execute the script after every one minute.