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linux_wiki:schedule_tasks_using_at_and_cron [2016/02/29 21:44] billdozor [cron] |
linux_wiki:schedule_tasks_using_at_and_cron [2019/05/25 23:50] (current) |
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| **General Information** | **General Information** | ||
| - | About this page/how-to/script. | + | Using system utilities |
| ---- | ---- | ||
| - | ==== at ==== | + | ===== at ===== |
| at is good for one-off jobs that don't need to reoccur regularly. | at is good for one-off jobs that don't need to reoccur regularly. | ||
| + | \\ | ||
| Install, Enable, Start | Install, Enable, Start | ||
| <code bash> | <code bash> | ||
| Line 17: | Line 19: | ||
| </ | </ | ||
| + | \\ | ||
| Example Times (teatime is 4pm) | Example Times (teatime is 4pm) | ||
| <code bash> | <code bash> | ||
| Line 26: | Line 29: | ||
| </ | </ | ||
| + | \\ | ||
| Example job | Example job | ||
| <code bash> | <code bash> | ||
| Line 33: | Line 37: | ||
| </ | </ | ||
| + | \\ | ||
| View jobs | View jobs | ||
| <code bash> | <code bash> | ||
| Line 38: | Line 43: | ||
| </ | </ | ||
| + | \\ | ||
| Remove job (cancel job) | Remove job (cancel job) | ||
| <code bash> | <code bash> | ||
| Line 45: | Line 51: | ||
| ---- | ---- | ||
| - | ==== cron ==== | + | ===== cron ===== |
| cron is for scheduling reoccurring jobs/ | cron is for scheduling reoccurring jobs/ | ||
| + | \\ | ||
| Edit current user's cron | Edit current user's cron | ||
| <code bash> | <code bash> | ||
| Line 54: | Line 61: | ||
| </ | </ | ||
| + | \\ | ||
| System wide | System wide | ||
| <code bash> | <code bash> | ||
| Line 67: | Line 75: | ||
| </ | </ | ||
| + | \\ | ||
| More preferred method: Place scripts inside one of the cron.* directories. | More preferred method: Place scripts inside one of the cron.* directories. | ||
| * / | * / | ||
| Line 74: | Line 83: | ||
| * / | * / | ||
| + | \\ | ||
| Example custom script in /etc/cron.d | Example custom script in /etc/cron.d | ||
| <code bash> | <code bash> | ||
| Line 82: | Line 92: | ||
| ---- | ---- | ||
| - | ==== Anacron ==== | + | ===== Anacron |
| Anacron runs all scripts in cron.* directories. This allows jobs to be run if the scheduled time was while a system was powered off. | Anacron runs all scripts in cron.* directories. This allows jobs to be run if the scheduled time was while a system was powered off. | ||
| + | \\ | ||
| Main config and contents: / | Main config and contents: / | ||
| <code bash> | <code bash> | ||
| Line 94: | Line 105: | ||
| </ | </ | ||
| + | \\ | ||
| Run all anacron jobs(in / | Run all anacron jobs(in / | ||
| <code bash> | <code bash> | ||
| Line 99: | Line 111: | ||
| </ | </ | ||
| + | \\ | ||
| View timestamps for anacron jobs (cron.daily in this example) | View timestamps for anacron jobs (cron.daily in this example) | ||
| <code bash> | <code bash> | ||
| Line 104: | Line 117: | ||
| </ | </ | ||
| + | \\ | ||
| Run all jobs now, ignore delay specifications in / | Run all jobs now, ignore delay specifications in / | ||
| <code bash> | <code bash> | ||