If there is an entry in crontab with the following syntax:

* * * * * /usr/bin/program

How often would this be run? How would it initially get launched?


Your cron entry will execute every single minute of every hour of every single day of every single month of every single year


A search for crontab syntax will give you man indepth explanations.

I find it handy to note the ordering in a comment at the top as a reminder.

  • Or you can just do man 5 crontab. – Dennis Williamson Oct 1 '10 at 1:31
  • @Dennis, do you really think most of us would remember what number to use in a man command? If we could remember that much we probably wouldn't need to keep using man. – John Gardeniers Oct 1 '10 at 1:41
  • @John: man crontab, scroll to the bottom, see See Also "crontab(5)", man man the sections are listed on the second (25-line) screenful. "5 File formats and conventions". My comment was not intended as an "oh should already know this", but as "here's some useful information". – Dennis Williamson Oct 1 '10 at 1:46
  • 1
    @Dennis, I've never noticed that in a man file, probably because I only look for specific information. I'll try to keep it in mind. Thanks. – John Gardeniers Oct 1 '10 at 2:00
  • Just man crontab will do. The crontab manpage is not always in section 5. I'm typing this from Slackware Linux 13.1 and it's in section 1 here. – halp Oct 1 '10 at 4:55

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