Systemindstillinger/Opgaveskemalægger

Generel Information

KCron lader dig køre programmer i baggrunden med regulære intervaller. Det er en grafisk brugerflade for Cron-kommandoen. KCron er et standardprogram, som følger med KDE's arbejdsomgivelser.

Brug

I 4.4 er KCron et modul, som findes i Systemindstillinger -> Avanceret -> System -> Opgaveskemalægger. Hvis den ikke findes der, så bør du sikre dig, at du har pakken kdeadmin installeret. I KDE 4.5 og senere versioner finder du den i Systemindstillinger -> afsnittet Systemadministration -> Opgaveskemalægger. I nogle distributioner kommer KCron som en særskilt pakke, så hvis du ikke kan se den, så søg i pakkearkiverne efter den.

Adding and Modifying tasks

• Click New Task... to add a new task, or "Modify" to modify an existing task. The Add or modify existing task page will be displayed.

The "Add or modify task" page of SystemSettings

• Enter the command to be run. Click the folder icon to choose it from a dialog.

• Enter a comment (optional). This should be descriptive, explaining what the task will do as the command may not always be obvious.

• Click Enable this task to enable the task to run.

• Click Run at system bootup to enable the script to run each time the system is booted.

• Click Run every day to enable the script to run every day. This will automatically select the appropriate options.

• Using the buttons, choose when the command should be run. Not all parameters are required, those not needed may be left blank.
  • Hours and Minutes are the time of day to run the task, not an interval.

• When done, click OK. The task will be added and scheduled if enabled.

Tip

Click Run Now to run a task immediately after adding or modifying the task.

Removing a task

To completely remove a task, select the task from the list and click the Delete button. This will permanently remove the task.

Environment Variables

Sometimes a task or multiple tasks need a specific variable set, it must be added in the Environment Variables section. The cron utility uses its own environment, system-wide and user-specific variables are not used. Click New Variable to add a new variable definition, or Modify to change an existing variable.

• Enter the name of the variable to use. This name:
  • Must consist of letters, digits, and underscore ('_') only
  • Must start with a latter
  • Should not be a reserved or commonly used system variable. See https://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html for more information

• The value the variable will contain. This can be a number or string.

• Enter a brief description of the variable.

Tips

• Alle de filer, som modificeres findes i mappen /etc/cron, hvor der er mange filer, som kan bruges som eksempler.

• Kommandolinje-værktøjet til at se det aktuelt installerede cron-job er

  crontab -l

  (det er bogstavet L).

More Information

• KDE official documentation
• Cron (Wikipedia)
• Cron (Arch Linux wiki)