[SOLVED] cron jobs for less than a minute

golden_boy615 · 05-08-2010, 03:16 PM

hello
how can I cron jobs for less than a minute for example configuring cron job to do something for each 15 seconds.

frostschutz · 05-08-2010, 04:22 PM

cron jobs is meant for stuff that runs every couple of hours, or even days, weeks, months, so doing something every minute is the best it can do

if you want to do something every 15 seconds, you could make a shell script and sleep instead

Code:

while [ 1 ]
do
    something
    sleep 15
done

golden_boy615 · 05-09-2010, 02:42 AM

Is any way except that? it makes busy waiting for that.

druuna · 05-09-2010, 04:18 AM

Hi,

The shortest time interval you can use with cron is 1 minute.

frostschutz's solution works, although you will introduce a sliding window (the next run will be 15 seconds + runtime of "something").

Hope this helps.

MTK358 · 05-09-2010, 06:55 AM

The sleep command does NOT busy wait, at least my version doesn't. I just tried it.