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

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[[Image:Kcron-screenshot-de.png|thumb|300px|center|KDE SC 4中的KCron]]
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]]


=== Usage ===
=== 用法 ===


First define what variables your application needs and their values, then select your application. When this is done you select at which times your application should be run and you're all set.
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。


In{{KDE4}}
=== Adding and Modifying tasks ===
In 4.4 '''KCron''' is a module which could be found in <menuchoice>System Settings -> Advanced -> System section -> Task Scheduler</menuchoice>.  If it is not present, please check that you have the '''kdeadmin''' package installed.  In KDE 4.5 you will find it in <menuchoice>System Settings -> System Administration section -> Task Scheduler</menuchoice>.  Some distros make '''KCron''' a separate package, so if it's not visible you should query your repository for it.


In{{KDE3}}
* 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.
KCron can be started using <keycap>Alt+F2</keycap> or K-Menu.


=== Hints ===
[[Image:kcron-task-dialog.png|thumb|300px|center|The "Add or modify task" page of SystemSettings]]


* All the files that are modified are located in the /etc/cron directory where there are numerous files to look at.
* Enter the command to be run. Click the folder icon to choose it from a dialog.


* The command-line tool that allows you to have a look at the currently installed cron-jobs is {{Input|1=crontab -l}} (that's the letter L).
* Enter a comment (optional). This should be descriptive, explaining what the task will do as the command may not always be obvious.


[[Category:System]]
* Click '''Enable this task''' to enable the task to run.
[[Category:KDE3]]
 
* 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 <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 ===
 
* 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{{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]]

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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