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#Schedule a time restart options greyed out windows#
The sixth field is alternatively sometimes used for year instead of an account username-the nncron daemon for Windows does this. This is allowed only in the system crontabs-not in others, which are each assigned to a single user to configure. Some cron implementations, such as the popular 4th BSD edition written by Paul Vixie and included in many Linux distributions, add a sixth field: an account username that runs the specified job (subject to user existence and permissions). The configuration file for a user can be edited by calling crontab -e regardless of where the actual implementation stores this file. įor example, the following clears the Apache error log at one minute past midnight (00:01) every day, assuming that the default shell for the cron user is Bourne shell compliant: While normally the job is executed when the time/date specification fields all match the current time and date, there is one exception: if both "day of month" (field 3) and "day of week" (field 5) are restricted (not contain "*"), then one or both must match the current day. The syntax of each line expects a cron expression made of five fields which represent the time to execute the command, followed by a shell command to execute. # │ │ │ │ │ 7 is also Sunday on some systems) Įach line of a crontab file represents a job, and looks like this: etc/cron.d) that only system administrators can edit. Users can have their own individual crontab files and often there is a system-wide crontab file (usually in /etc or a subdirectory of /etc e.g.
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The crontab files are stored where the lists of jobs and other instructions to the cron daemon are kept. The actions of cron are driven by a crontab (cron table) file, a configuration file that specifies shell commands to run periodically on a given schedule.
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1.1 Nonstandard predefined scheduling definitions.