Crontab Linux example

Important Crontab Examples

1. What does 30 * * * * mean in crontab?
2. What does * 5 * * * mean in cron?
3. What is * * * * * In cron job?
4. What does 0 * * * * mean in crontab?
5. What does cron */ 2 mean?
6. How do I run crontab every 12 hours?
7. How do I run cron every 5 minutes?
8. How do I run a cron job every 30 seconds?
9. How do I run a cron job every 10 minutes?
10. How do I schedule a .sh file in Linux?
11. How do I schedule a SQL crontab script?
12. How do I run a script every 5 minutes in Linux?

What does 30 * * * * mean in crontab?

*/30 * * * * your_command. this means "run when the minute of each hour is evenly divisible by 30" (would run at: 1:30, 2:00, 2:30, 3:00, etc) example #3. 0,30 * * * * your_command. this means "run when the minute of each hour is 0 or 30" (would run at: 1:30, 2:00, 2:30, 3:00, etc)

What does * 5 * * * mean in cron?

Show activity on this post. 5 * * * * means it runs once per hour at five minutes past the hour. */5 * * * * means it runs once every five minutes.

What is * * * * * In cron job?

Cron job format

A schedule is defined using the unix-cron string format ( * * * * * ) which is a set of five fields in a line, indicating when the job should be executed. You can use either the Google Cloud console, the Google Cloud CLI, or the Cloud Scheduler REST API to set your schedule.

What does 0 * * * * mean in crontab?

0 * * * * -this means the cron will run always when the minutes are 0 (so hourly) 0 1 * * * - this means the cron will run always at 1 o'clock. * 1 * * * - this means the cron will run each minute when the hour is 1. So 1:00 , 1:01 , ... 1:59 .

What does cron */ 2 mean?

so */2 means every other hour, */3 every third hour, etc. The default step is 1, so you can omit /1 if you want a step value of 1. see the crontab(5) man page for more detail.

How do I run crontab every 12 hours?

->cron('0 */12 * * *'); This cron will run the scheduler at every 12 hours.

How do I run cron every 5 minutes?

To execute a crontab every 5 minutes, we need to use the slash (/) special character followed by 5, which acts as a step that crontab should execute the command after every 5 minutes. Note that the 5 is in the first field of Minutes.

How do I run a cron job every 30 seconds?

Are you new to the cron job scheduler and want to run a job every 30 seconds? Unfortunately, cron does not allow for it. You can not schedule a cron job to run every x second. Cron only supports a time interval of at least 60 seconds (i.e 1 minute).

How do I run a cron job 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.

How do I schedule a .sh file in Linux?

Here, by using an asterisk in the last three fields (1-31 days, 1-12 months, all days of the week), our backups.sh script will run every day at 3 pm. In the above expression, 2-50/10 in the minute field indicates the second minute of the hour and every 10 minutes thereafter.

How do I schedule a SQL crontab script?

To schedule our python script, use the below commands. */5 * * * * This line tells crontab that the following cronjob will be triggered every 5 Minutes The cron scheduling syntax is a little overwhelming in the beginning, But the good news is, you can use Crontab.

How do I run a script every 5 minutes in Linux?

A crontab has 5 fields separated by spaces. Each of the fields specifies the date and time a command should execute. To execute a crontab every 5 minutes, we need to use the slash (/) special character followed by 5, which acts as a step that crontab should execute the command after every 5 minutes.