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| How to Run Cron every second, cron every second |
Question 1: how to run cron in every second
It's not possible to run cron in every second but we can run cron in every second using this method, we use a sleep command before the echo date.
* * * * * echo `date -I` >> /tmp/cron.log
* * * * * sleep 1 ; echo `date -I` >> /tmp/cron.log
* * * * * sleep 2 ; echo `date -I` >> /tmp/cron.log
* * * * * sleep 3 ; echo `date -I` >> /tmp/cron.log
...........
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* * * * * sleep 59 ; echo `date -I` >> /tmp/cron.log
Question 2: Differences between cron and crontab
Cron - Cron is command name that runs scheduled action using the crond daemon.
Crontab - crontab is file name that containing jobs scheduled details like
* * * * * < CMD >
* -Minute
* - Hour
* - Day
* - Month
* - Day of Week ( like Sunday 0, Monday 1, Tuesday 2 and so for
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Question 2 - Set cronjob to run command on every day 4:30 PM
30 16 * * * /bin/bash /opt/backup.sh
Question 3 - How to run cron after every reboot
@reboot /bin/bash /opt/start-vm.sh
Question 4 - deny particular user using from scheduling cron jobs?
Answer: Make entry of user in /etc/cron.deny file
Question 5 - Is required to restart cron service after any change
Answer - No
