I'm trying to get a simple crontab job to run every 15 minutes and am having trouble deciding how to format the timing.
What I've been putting down is the following:
15 * * * * ------------------------
I'm pretty sure this just runs the first 15 minutes of every hour.
I think that crontab allows users to specify exact times to run, namely:
0, 15,30,45 * * * * -------------------------
But if I wanted to run the crontab every 15 minutes from the moment I start it, (which may not necessarily be on a value divisible by 15), how would I go about formatting that/is that possible?
Run a Cron Job after every 10 minutes The slash operator helps in writing the easy syntax for running a Cron job after every 10 minutes. In this command, */10 will create a list of minutes after every 10 minutes.
basic 3. /usr/bin/vim. tiny 4. /bin/ed Choose 1-4 [1]: Make a new line at the bottom of this file and insert the following code. Of course, replace our example script with the command or script you wish to execute, but keep the */5 * * * * part as that is what tells cron to execute our job every 5 minutes.
It is a wildcard for every part of the cron schedule expression. So * * * * * means every minute of every hour of every day of every month and every day of the week .
Crontab doesn't remember what time you "started" (presumably the time you executed the crontab -e
or crontab filename
command).
If you want to run the job every 15 minutes starting from an arbitrary time, you'll have to specify that time. This:
7-59/15 * * * * command
will run at 7, 22, 37, and 52 minutes after each hour. That's assuming you're running Vixie cron, which is the most common implementation. For better portability, you can use:
7,22,37,52 * * * * command
And remember that you can't have spaces within any of the first 5 fields; 0, 15,30,45
, as you had in your question, is invalid.
You would format the crontab like this to get it to run every 15 minutes.
*/15 * * * * [path/to/script]
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