May 2, 2012

Daily Cron Job Example


I want to run a command daily on an Ubuntu Linux box @ 9:15PM. Is this the correct entry for my crontab?

15 23 * * * <<command>>
Asked by Trent Scott


The syntax is, the hours not

minute hour dayofmonth month dayofweek     command

Your command will run every day at 23:15 (11:15pm)

9pm is 21 (in 24h writing 12 + 9 = 21)

15 21 * * *  command
Answered by mulaz

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  2. Difference between using crontab and /etc/cron.hourly,daily,weekly
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