Crontab: Difference between revisions
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(New page: Crontab is the equivelant of the scheduler in Windows. Crontab Commands <table cellspacing="0" cellpadding="0"> <tr> <td width="120"> </td> <td>crontab -e</td> <td width="20">...) |
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Crontab is the equivelant of the scheduler in Windows. | Crontab is the equivelant of the scheduler in Windows. | ||
Crontab Commands | === Crontab Commands === | ||
<table cellspacing="0" cellpadding="0"> | <table cellspacing="0" cellpadding="0"> | ||
<tr> | <tr> | ||
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Crontab | === Crontab File === | ||
A crontab file has five fields for specifying day , date and time followed by the command to be run at that interval. | A crontab file has five fields for specifying day , date and time followed by the command to be run at that interval. | ||
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| +----------- hour (0 - 23) | | +----------- hour (0 - 23) | ||
+------------- min (0 - 59) | +------------- min (0 - 59) | ||
</pre> | |||
=== Disable Email === | |||
By default cron jobs sends a email to the user account executing the cronjob. If this is not needed put the following command At the end of the cron job line . | |||
<pre> | |||
>/dev/null 2>&1 | |||
</pre> | </pre> | ||
[[Category : Linux]] | [[Category : Linux]] | ||
Revision as of 05:43, 3 October 2007
Crontab is the equivelant of the scheduler in Windows.
Crontab Commands
| crontab -e | Edit your crontab file, or create one if it doesn't already exist. | ||
| crontab -l | Display your crontab file. | ||
| crontab -r | Remove your crontab file. | ||
| crontab -v | Display the last time you edited your crontab file. |
Crontab File
A crontab file has five fields for specifying day , date and time followed by the command to be run at that interval.
* * * * * command to be executed - - - - - | | | | | | | | | +----- day of week (0 - 6) (Sunday=0) | | | +------- month (1 - 12) | | +--------- day of month (1 - 31) | +----------- hour (0 - 23) +------------- min (0 - 59)
Disable Email
By default cron jobs sends a email to the user account executing the cronjob. If this is not needed put the following command At the end of the cron job line .
>/dev/null 2>&1
