Pak Jiddat

Read: In the name of thy Lord Who createth, Createth man from a clot. Read: And thy Lord is the Most Bounteous, Who teacheth by the pen, Teacheth man that which he knew not. Nay, but verily man is rebellious That he thinketh himself independent!. Lo! unto thy Lord is the return. (Sura Alalaq 96:8)

Running Cron jobs at random intervals

Created On: 18 Dec, 2018: 18:53:59 - Tags : command line tools | server management


To run a Cron Job at random intervals we need to prefix the Cron Job command with the sleep bash command. For example to run a Cron Job every 5 to 7 hours at random intervals, we can use the following:

0 */5 * * * sleep $[RANDOM\%120]m; path-to-script

In the above code, the '%' has to be escaped. The code: $[RANDOM\%120] generates a random number between 0 and 120. This is the number of minutes that script will pause

The script will run at the times: 05:00+(rand(0, 120)), 10:00+(rand(0, 120)), 15:00+(rand(0, 120)), 20:00+(rand(0, 120)) and 00:00+(rand(0, 120))

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