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I need to run a cron job every 2 minutes (*/2) but only for the first 30 minutes of every hour, with pause of 30 minutes between the runs.

For example, something like:

  • From 10h00 to 10h30: run every 2 minutes
  • From 10h30 to 11h00: nothing to run
  • From 11h00 to 11h30: run every 2 minutes
  • etc...

How can I achieve this result?

  • is this homework? You could wrap the command in a script to loop 15 times {call command, wait 2 minuets} – ctrl-alt-delor Sep 14 '12 at 10:59
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Can you run after the half hour instead of before? If so this should work for you...

30/2 * * * *    

If not you would have to designate each of the minutes you want it to run...

2,4,6,8,10,12,14,16,18,20,22,24,26,28,30 * * * *    

Not sure if your hourly was supposed to recur throughout the day or not but I assumed so.

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  • Perfect. Simple way, i was thinking for something much more complicated instead of thinking a simple way... thanks – Hugo ferreira Sep 14 '12 at 11:23
  • I brain farted and had an extra 0 in front... not even sure how it ended up there, lol. I corrected it though so make sure what you took from it matches. – Omnikrys Sep 14 '12 at 11:50
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this should work: 0-30/2 * * * *

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