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How to Set up a Crontab File on Linux

Cron is a job scheduling subsystem for linux. It is used for scheduling repeating jobs. If you wish to schedule a one shot job use the at subsystem. All users on a linux box may set up cron jobs provided they are allowed by the...

★ Set up automatic mode in Linux with Crontab
★ What is ISO file?
Method 1 of 2:

Setting up the File

  1. How to Set up a Crontab File on Linux Picture 1
    Using your favourite editor, create a cron file with a line for each job you wish to schedule, in the format: m h d m w command
    • m minute
    • h hour
    • d day of month
    • m month 1-12
    • w weekday 0-7, Sun,Mon, etc (Sunday = 0 = 7) It is easy to remember if you think of the way one would say a date: Wednesday, July 29, at 10:30, then reverse the order.
  2. How to Set up a Crontab File on Linux Picture 2
    Load your file into crontab: crontab yourfile
Method 2 of 2:

Trying an Example

  1. Create a file testCron.txt containing the following lines:
    • # do this every 10 minutes
    • */10 * * * * date >> ~/testCron.log
  2. How to Set up a Crontab File on Linux Picture 3
    Load it into cron: crontab testCron.txt
  3. Wait 30 minutes, check testCron.log, if it works it will update your file with a time stamp 3 times.
  4. How to Set up a Crontab File on Linux Picture 4
    Remove the crontab so that it does not run forever: crontab -r

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Samuel Daniel

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Samuel Daniel
Update 04 March 2020

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