Pre-Grant Publication Number: 20110167048
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Prior Art Detail
Summary / Description
| Summary / Description | The cron utility is part of all UNIX operating systems. It takes as input a crontab file of all actions to execute and the time, day, year, month, week, and frequency the tasks should be run. |
Basic Information
| Type of Prior Art | Print Publication |
| Publication Title * | AIX Version 5.3 command reference, volume 1 |
| Author | |
| ISBN | |
| Page Range | 546-552 |
| Medium | Book excerpt |
| Publication Date * | July 1, 2006 |
| URL | |
Notes / To Do
| Notes | |
Excerpt
Excerpt "Each crontab file entry contains six fields separated by spaces or tabs in the following form:
minute hour day_of_month month weekday command
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Claims
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Relevance
Scheduling a task to execute through cron utility is analogous to adding a log management task to a task list of an operating system.
Scheduling a task to execute through cron utility is analogous to adding a log management task to a task list of an operating system.
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The cron utility can be configured to execute a task daily. The following is from http://en.wikipedia.org/wiki/Cron.
Predefined scheduling definitions
There are several special predefined values which can be used to substitute the CRON expression.
Entry Description Equivalent To
@yearly (or @annually) Run once a year, midnight, Jan. 1st 0 0 1 1 *
@monthly Run once a month, midnight, first of month 0 0 1 * *
@weekly Run once a week, midnight on Sunday 0 0 * * 0
@daily Run once a day, midnight 0 0 * * *
@hourly Run once an hour, beginning of hour 0 * * * *
@reboot Run at startup
* * * * * command to be executed
┬ ┬ ┬ ┬ ┬
│ │ │ │ │
│ │ │ │ │
│ │ │ │ └───── day of week (0 - 7) (Sunday=0 or 7)
│ │ │ └────────── month (1 - 12)
│ │ └─────────────── day of month (1 - 31)
│ └──────────────────── hour (0 - 23)
└───────────────────────── min (0 - 59)
The cron utility can be configured to execute a task daily. The following is from http://en.wikipedia.org/wiki/Cron.
Predefined scheduling definitions
There are several special predefined values which can be used to substitute the CRON expression.
Entry Description Equivalent To
@yearly (or @annually) Run once a year, midnight, Jan. 1st 0 0 1 1 *
@monthly Run once a month, midnight, first of month 0 0 1 * *
@weekly Run once a week, midnight on Sunday 0 0 * * 0
@daily Run once a day, midnight 0 0 * * *
@hourly Run once an hour, beginning of hour 0 * * * *
@reboot Run at startup
* * * * * command to be executed
┬ ┬ ┬ ┬ ┬
│ │ │ │ │
│ │ │ │ │
│ │ │ │ └───── day of week (0 - 7) (Sunday=0 or 7)
│ │ │ └────────── month (1 - 12)
│ │ └─────────────── day of month (1 - 31)
│ └──────────────────── hour (0 - 23)
└───────────────────────── min (0 - 59)
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