Run Cron every 2 minutes in 30 minutes?

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?

2 Answers

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.

this should work: 0-30/2 * * * *