Crontab

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The application implements a time-based job scheduler named Crontab. In crontab view there are a set a jobs that are executed periodically at fixed times or intervals.

Crontab is shown in a table structure.

Name Expression Mime File name Mail Last begin Last end Active

Crontab parameters

Field	Description	Required
Name	Job name.	true
Expression	Sets when the job is executed. Takes in consideration the status of the application when the task will be executed. For example, if you stop the application at 00:00 to perform a backup, it delays the task until you consider the backup process will be completed.	true
Mime	Supported MIME types: - application/x-bsh ( BeanShell ). - application/x-java-archive ( JAR file ). The application supports tasks written in beanshell or classes into JAR file. We recommend using JAR files instead of beanshell. More information at: Creating your own Crontab job.	true
Mail	When present, a mail is sent as part of the task once the execution has been completed. You can use several mail addresses using a comma “,” as separator.	false
Last begin	Shows the last time a process started.	-
Last end	Shows the last time a process was completed.	-
Active	Enables or disables the process execution.	true

Understanading expresion syntax

The commands are executed by cron when the minute, hour, and month fields match the current time, and when at least one of the two day fields (day of month, or day of week) match the current time. The scheduler examines crontab entries once every minute. The time and date fields are:

* * * * * command to execute
 │ │ │ │ │
 │ │ │ │ │
 │ │ │ │ └──── day of week (0 - 6) (0 to 6 are Sunday to Saturday, or use names; 7 is Sunday, the same as 0)
 │ │ │ └───────── month (1 - 12)
 │ │ └────────────── day of month (1 - 31)
 │ └─────────────────── hour (0 - 23)
 └──────────────────────── min (0 - 59)

Field	Values
minute	0-59
hour	0-23
day of month	1-31
month	1-12

Other expressions:

Expression	Equivalent	Description
@yearly	0 0 1 1 *	Runs once a year at midnight of January 1.
@annually	0 0 1 1 *	Same as @yearly.
@monthly	0 0 1 * *	Runs once a month at midnight of the first day of the month.
@weekly	0 0 * * 0	Runs once a week at midnight on Sunday morning.
@daily	0 0 * * *	Runs once a day at midnight.
@midnight	0 0 * * *	Same as daily.
@hourly	0 * * * *	Runs once an hour at the beginning of the hour.

A field may be an asterisk (*), which always stands for first-last.

Ranges of numbers are allowed. Ranges are two numbers separated with a hyphen. The specified range is inclusive. For example, “8-11” for an hours entry specifies execution at hours 8, 9, 10 and 11.

Lists are allowed. A list is a set of numbers (or ranges) separated by commas. Examples: “1,2,5,9”, “0-4,8-12”.

Step values can be used in conjunction with ranges. Following a range with “/” specifies skips of the number’s value through the range. For example, “0-23/2” can be used in the hours field to specify command execution every other hour. Steps are also permitted after an asterisk, so if you want to say “every two hours”, just use “*/2”.

Names can also be used for the month and day of week fields. Use the first three letters of the particular day or month (case doesn’t matter). Ranges or lists of names are not allowed.