Run crontab (cron jobs) Every 10 Minutes

Posted on in Categories , , last updated May 19, 2015

How do I run a cron job or a shell script every 10 minutes using Linux / UNIX cron service?

Cron> is a time-based scheduling service in a Linux or Unix-like computer operating systems. Cron job are used to schedule commands to be executed periodically. You can setup commands or scripts, which will repeatedly run at a set time. Cron is one of the most useful tool in Linux or UNIX like operating systems. The cron service (daemon) runs in the background and constantly checks the /etc/crontab file, /etc/cron.*/ directories. It also checks the /var/spool/cron/ directory.

First, Login to UNIX/Linux system.

Type the following command to enter cronjob:
$ crontab -e
Each cronjob has the following syntax:

# +---------------- minute (0 - 59)
# |  +------------- hour (0 - 23)
# |  |  +---------- day of month (1 - 31)
# |  |  |  +------- month (1 - 12)
# |  |  |  |  +---- day of week (0 - 6) (Sunday=0 or 7)
# |  |  |  |  |
  *  *  *  *  *  command to be executed

To get crontab to run a task every 10 minutes you could type as follow:
*/10 * * * * /path/to/command
OR
*/10 * * * * /path/to/script
Save and close the file.
Where,

  1. The asterisk (*) operator specifies all possible values for a field. For example, an asterisk in the hour time field would be equivalent to every hour or an asterisk in the month field would be equivalent to every month.
  2. The */10 is used in conjunction with ranges. For example, 0-23/2 can be used in the hours field to specify command execution every other hour. Steps are also permitted after an asterisk, so if you want to say every two hours just use */2. In this example, */10 in the minutes field to specify command execution every 10 minute.
See also

23 comment

  1. */10 * * * * /home/test.sh > /dev/null 2>&1
    crontab: error on previous line; unexpected character found in line.
    crontab: errors detected in input, no crontab file generated.

    Guess it does not work in Solaris 8

  2. OR

    sudo -i
    cd /etc/cron.d
    touch command
    vi command
    # in command file
    [email protected]
    */10 * * * * /path/to/command

    # save command file and exit
    if you do not want to receive a letter then
    MAILTO=””

  3. what if I need to start the script at 3:00 AM exactly and consecutive executions should begin after every 10 mins.
    eg: 3:00 3:10 3:20 etc… lifetime

    But the clause is, it should start exactly at 3:00. I can play in scripts. But is there an option like this in crons?

    1. */10 3,4,5 * * *
      It will be called
      WHEN ( MINUITES DIVIDED BY 10 AND DIVISION REMAINDER EQUALS 0
      AND
      ( HOUR EQUALS 3 ) OR ( HOUR EQUALS 4 ) OR ( HOUR EQUALS 5 ) )

      So it will run at 3.00, 3.10, 3.20, 3.30, 3.40, 3.50, 4.00, 4.10….. 5.50

      1. so can I go like this to start at 3AM and then by 10 mins invokes would this continue around the clock?
        */10 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,1,2 * * *

          1. I think Mannoj wanted a cron job that runs 3:00 AM for the first time and every 10 minutes from 3:00 AM and goes on. But your cron job runs only at 3 to 24 every 10 minutes that is not the answer!

  4. What this post doesn’t explain is why it works. In a crontab, the / symbol means that it will run if the current value can be divided by the following number without a remainder.

    This isn’t important for simple timers like ‘every ten minutes’, but can be very useful when using more advanced calculations.

  5. You see the / option posted all over the net as a shortcut for “every” but I do not believe it is applicable to all systems, for instance I do not believe this will work on AIX.

    Just sayin…

  6. */10 means every 10 min.It is understandable.But,when will the the scripts will run? I meant script run times…?

  7. i want to run this script for 30 mins after every 15 mins how can i do that ??

    the below one is doing for 5 min after 1 hour. i want 30 min after 15 mins break

    0 * * * * nohup /home/pi/mmal/motion -n -c /home/pi/mmal/motion-mmalcam.conf 1>/dev/null 2>&1 </dev/null &

    5 * * * * pkill -9 motion

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