Although unices are good with short-lived processes, the overhead of launching a program every 15 seconds might be non-negligible (depending on how demanding the program is). I will however note that if you need to run a job as often as every 15 seconds, cron is probably the wrong approach. If you put it directly in a crontab, note that % characters must be written as \% in a crontab line. Cronitor is easy to integrate and provides you with instant alerts when things go wrong. How to run a cron jobs in every minute for a specific hour on server. Can anybody show me how is it possible to do that in Ubuntu ubuntu cron Share. We created Cronitor because cron itself cant alert you if your jobs fail or never start. I have three different php files which I want to schedule every: hour, half hour, 15 minutes. GNU or Busybox, so you'll be ok on Linux). Cron job every 1 minute is a commonly used cron schedule. It relies on date supporting the %s format (e.g. The following slightly more complex script takes care of not running the next instance if one took too long to run. This script assumes that the job will never take more than 15 seconds. * * * * * for i in 0 1 2 do some_job & sleep 15 done some_job The following crontab line will start some_job every 15 seconds. What you can do is, every minute, run a script that runs your job, waits 15 seconds and repeats. Although it isnt exactly what you wanted I hope this helps as a base. This is the closest I could get with one:30-59/15 9-14 1-5 which equates to Every 15 minutes, minutes 30 through 59 past the hour, between 09:00 AM and 02:59 PM, Monday through Friday. You can't go below one minute granularity with cron. As far as I can tell you wont be able to do what you want with a single job.
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