System Settings/Task Scheduler/zh-cn: Difference between revisions

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[[Image:Kcron-screenshot-de.png|thumb|300px|center|The Task Scheduler in Plasma 5]]
Task Scheduler is a graphical front end to the standard "cron" utility. With it, commands (or "tasks") can be run at specific times, on a certain day or date, or at specific intervals (time between execution).
 
[[Image:Kcron-screenshot-de.png|thumb|300px|center|Task Scheduler in Plasma 5]]


=== 用法 ===
=== 用法 ===


Task Scheduler can be started by starting the '''System Settings''' application, and selecting <menuchoice>Startup and Shutdown -> Task Scheduler</menuchoice>.
到了KDE 4.4 中'''KCron''' 是<menuchoice>系统设定-> 高阶-> 系统 -> 任务调度 </menuchoice>的模组。如果没找到，请检查是否已安装'''kdeadmin''' 包。 KDE 4.5 中是在 <menuchoice>系统设定-> 系统管理员-> 任务调度 </menuchoice>。一些发行版将 '''KCron'''单独弄成一个包，所以你得自己找找。
New tasks can be added and existing tasks edited or removed.


==== Adding and Modifying tasks ====
=== 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.
* Click <menuchoice>New Task...</menuchoice> to add a new task, or "Modify" to modify an existing task. The '''Add or modify existing task''' page will be displayed.


[[Image:kcron-task-dialog.png|thumb|300px|center|The "Add or modify task" page of SystemSettings]]
[[Image:kcron-task-dialog.png|thumb|300px|center|The "Add or modify task" page of SystemSettings]]
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* When done, click <menuchoice>OK</menuchoice>. The task will be added and scheduled if enabled.
* When done, click <menuchoice>OK</menuchoice>. The task will be added and scheduled if enabled.
{{Tip|Click <menuchoice>Run Now</menuchoice> 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 letter
** 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.


=== 提示 ===
=== 提示 ===
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* 查看现在安装好的cron任务的命令行工具是{{Input|1=crontab -l}}（小写的字母L）
* 查看现在安装好的cron任务的命令行工具是{{Input|1=crontab -l}}（小写的字母L）
==More Information==
* [https://docs.kde.org/stable5/en/kdeadmin/kcontrol5/kcron/index.html KDE official documentation]
* [https://en.wikipedia.org/wiki/Cron Cron] (Wikipedia)
* [https://wiki.archlinux.org/index.php/cron Cron] (Arch Linux wiki)


[[Category:系统/zh-cn]]
[[Category:系统/zh-cn]]

Latest revision as of 08:30, 1 June 2019

Other languages:

常规信息

KCron是个定期在后台运行程序的工具。他是Cron命令的图形界面。

KCron是个标准的KDE工作区应用程序。

Task Scheduler is a graphical front end to the standard "cron" utility. With it, commands (or "tasks") can be run at specific times, on a certain day or date, or at specific intervals (time between execution).

Task Scheduler in Plasma 5

用法

到了KDE 4.4 中KCron 是系统设定-> 高阶-> 系统 -> 任务调度 的模组。如果没找到，请检查是否已安装kdeadmin 包。 KDE 4.5 中是在 系统设定-> 系统管理员-> 任务调度 。一些发行版将 KCron单独弄成一个包，所以你得自己找找。

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.

  • The value the variable will contain. This can be a number or string.
  • Enter a brief description of the variable.

提示

  • 全部修改的文件都位于拥有许多文件的/etc/cron目录。
  • 查看现在安装好的cron任务的命令行工具是
    crontab -l
    （小写的字母L）

More Information

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