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| ubuntu:cron [2019/12/12 23:53] – peter | ubuntu:cron [2021/07/05 21:53] (current) – [Cron] peter |
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| The jobs inside the crontab file are known as cron jobs, and consist of standard Linux commands. They also contain the time-period when cron needs to execute them. | The jobs inside the crontab file are known as cron jobs, and consist of standard Linux commands. They also contain the time-period when cron needs to execute them. |
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| | <code bash> |
| | ┌───────────── minute (0 - 59) |
| | │ ┌───────────── hour (0 - 23) |
| | │ │ ┌───────────── day of the month (1 - 31) |
| | │ │ │ ┌───────────── month (1 - 12) |
| | │ │ │ │ ┌───────────── day of the week (0 - 6) (Sunday to Saturday; |
| | │ │ │ │ │ 7 is also Sunday on some systems) |
| | │ │ │ │ │ |
| | │ │ │ │ │ |
| | * * * * * <command to execute> |
| | </code> |
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| {{:ubuntu:crontab-structure.jpg?800|}} | {{:ubuntu:crontab-structure.jpg?800|}} |
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| [[Ubuntu:Cron:List Crontab|List Crontab]] | [[Ubuntu:Cron:List Crontab|List Crontab]] |
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| | [[Ubuntu:Cron:Send Cron Results to Specified Email Account|Send Cron Results to Specified Email Account]] |
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| [[Ubuntu:Cron:Set crontab editor to vim|Set crontab editor to vim]] | [[Ubuntu:Cron:Set crontab editor to vim|Set crontab editor to vim]] |
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| [[Ubuntu:Cron:Schedule a Cron Job to Run on Specified Months|Schedule a Cron Job to Run on Specified Months]] | [[Ubuntu:Cron:Schedule a Cron Job to Run on Specified Months|Schedule a Cron Job to Run on Specified Months]] |
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| | [[Ubuntu:Cron:Schedule a Cron Job to Run on 15 January at 8 PM|Schedule a Cron Job to Run on 15 January at 8 PM]] |
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| | [[Ubuntu:Cron:Schedule a Cron Job to Run in Every Second Month|Schedule a Cron Job to Run in Every Second Month]] |
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| | [[Ubuntu:Cron:Schedule a Cron Job to Run on the First Sunday of Each Month|Schedule a Cron Job to Run on the First Sunday of Each Month]] |
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| | [[Ubuntu:Cron:Schedule a Cron Job to Run on Every Three Hours|Schedule a Cron Job to Run on Every Three Hours]] |
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| | [[Ubuntu:Cron:Schedule a Cron Job to Execute Twice on Every Saturday and Monday|Schedule a Cron Job to Execute Twice on Every Saturday and Monday]] |
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| | [[Ubuntu:Cron:Schedule a Cron Job to Run on Every 30 Seconds|Schedule a Cron Job to Run on Every 30 Seconds]] |
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| | [[Ubuntu:Cron:Schedule Multiple Jobs in a Single Crontab Entry|Schedule Multiple Jobs in a Single Crontab Entry]] |
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| | [[Ubuntu:Cron:Schedule Yearly Cron Jobs|Schedule Yearly Cron Jobs]] |
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| | [[Ubuntu:Cron:Schedule Monthly Cron Jobs|Schedule Monthly Cron Jobs]] |
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| | [[Ubuntu:Cron:Schedule Weekly Cron Jobs|Schedule Weekly Cron Jobs]] |
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| | [[Ubuntu:Cron:Schedule Daily Cron Jobs|Schedule Daily Cron Jobs]] |
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| | [[Ubuntu:Cron:Schedule Hourly Cron Jobs|Schedule Hourly Cron Jobs]] |
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| | [[Ubuntu:Cron:Schedule a Cron Job on System Reboot|Schedule a Cron Job on System Reboot]] |
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