* | any value |

, | value list separator |

- | range of values |

/ | step values |

### How to run crontab every 4 hours?

Cronjob is a fantastic feature, that enables you to schedule your repetitive jobs. 0 */4 * * * let's you run a script/program every 4 hours. All you need to do is, configure this cronjob in your system with the script/program you want to run, which can be done in an unix/linux based operating system as following:

Step 1: Edit your cronjob file by running "crontab -e" command

Step 2: Add the following line for every 4 hours interval:

0 */4 * * * /path/to/your/script-or-program

Step 3: Save the file. That's it!### How to run a script in crontab every 4 hours?

Cronjob let's you run a script to do a repetitive job in an efficent way, here's how you can schedule a cronjob for every 4 hours:

Step 1: Edit your cronjob file by running "crontab -e" command

Step 2) Add the following line for every 4 hours interval:

0 */4 * * * /path/to/your/script

Step 3: Save the file. That's it!### Is 0 */4 * * * the right expression for every 4 hours?

Absolutely, this is the correct expression for the magic you are looking for. 0 */4 * * * let's you run a cronjob every 4 hours.

### What are some examples of every 4 hours crontab?

There are potentially infinte examples for it. Think about any job that you want to run every 4 hours, it can be processing some data, generating a report, crawling an external source, pinging another service etc.

For example, if I want to check uptime of my website in every 1 minute, I can write a program to do this for me using this powerful functionality of scheduling.

- every 10 minutes
- every 5 minutes
- every minute
- every 2 minutes
- every 3 minutes
- every 4 minutes
- every 15 minutes
- every 30 minutes
- every 12 hours
- every week
- monday to friday
- every year
- every 6 month
- every quarter
- once a month
- every friday
- every thursday
- every saturday
- every 45 minutes
- every 50 minutes
- every 40 minutes
- every 21 minutes
- every 17 minutes
- every 19 minutes
- every 11 minutes
- every hour
- every 2 hours
- every 3 hours
- every 4 hours
- every 5 hours
- every 6 hours
- twice a day
- 3 times a day
- every day of week
- every 7 days
- every 10 days
- every 90 days
- every 15 days
- every 30 days
- every monday
- every tuesday
- every wednesday
- every sunday
- first Day of Month