It contains an additional mandatory user field that specifies which user will run the cron job. The syntax of system-wide crontab files is slightly different than user crontabs. To specify a job to be run every 20 minutes, you can use “*/20”. Instead of a range of values, you can also use the asterisk operator. For example, if you have 1-10/2 in the Minutes field, it means the action will be performed every two minutes in range 1-10, same as specifying 1,3,5,7,9.
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