c# qr code encoder Scheduling Tasks with the Schtasks Command in C#

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Scheduling Tasks with the Schtasks Command
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The Scheduled Tasks facility provides a friendly and versatile method of creating and managing scheduled tasks. In some instances, however, you might find it easier to manage scheduled tasks from a command prompt. For those occasions, Windows XP provides the Schtasks command, a replacement for the venerable At command that was included with previous versions of the Windows NT platform. Note You can continue to enter At commands at the command prompt or in batch programs; tasks that you set up this way appear in the Scheduled Tasks folder, identified as Atn, where n is a task ID supplied by the system. If you edit an At task in Scheduled Tasks, however, the task is upgraded to a normal scheduled task. At that point, you can no longer delete the task at a command prompt, and you must supply user credentials (account name and password) before the task can run. With Schtasks, you can create, modify, delete, end, view, and run scheduled tasks, on your own computer or on another computer on your network. The Schtasks command is a boon not only for Windows XP users who prefer working at an MS-DOS-style prompt, but more importantly, for you to manage scheduled tasks from batch files. Note The Schtasks command is available only to computer administrators. Others who attempt to use it are rebuffed with the message ERROR: Access is denied. Schtasks is a rather complex command with lots of command-line switches and other parameters (its description in the Help And Support Center runs to 16 densely packed pages of text), but it has only six main variants:
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Schtasks /Create
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This variant, which you use to create a new scheduled task, is the most complex because of all the scheduling flexibility. You can, for example, set up a schedule at an interval expressed in minutes, hours, days, weeks, or months in addition to the event-based schedules, such as on startup, on logon, and when the system is idle. This variant allows you to modify an existing task. You can change the program that the task runs, the user account under which the task runs, or the password for the user account.
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Schtasks /Change
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Schtasks /Delete Schtasks /End Schtasks /Query Schtasks /Run
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This variant deletes an existing scheduled task or, optionally, all scheduled tasks on a computer. This variant stops a program that was started by a scheduled task. This variant displays all scheduled tasks on a computer, including those that were created by other users. This variant immediately starts a scheduled task, ignoring the schedule that was created for the task.
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You can get more information about each of these variants of Schtasks by viewing the descriptions in the Help And Support Center or by appending / to one of these commands at a command prompt. For example, for detailed information about Schtasks /Run, at a command prompt type:
schtasks /run /
schtasks /create /tn "Solitaire break" /tr sol.exe /sc hourly /mo 4 /st 00:20:00
In this example, the /Tn switch specifies the name of the task, /Tr specifies the name of the executable program (if the program is not stored in the %SystemRoot%\System32 folder, you must specify the complete path to the program), /Sc specifies the schedule type, /Mo specifies the interval, and /St specifies the starting time. When you create a task as shown in this example, you ll see that Schtasks prompts you for the password for your account. You can bypass this prompt by appending /rp password to the command, where password is your logon password. The following example creates a scheduled task that runs a script on the last Friday of each calendar quarter. (This isn t a script that s included with Windows; it s a made-up name intended to spark ideas on your part!)
schtasks /create /tn "Quarterly wrap-up" /tr c:\apps\qtrwrap.vbs /sc monthly /mo last /d fri /m mar,jun,sep,dec
By default, tasks scheduled via the Schtasks command run under the user account that s currently logged on. To make them run under a different user account, use the /Ru switch followed by the user account name you want to use; you ll also need to know the logon password for that account. To use the built-in System account, append /ru System to the command. No password is required for the System account, but because only administrators can use Schtasks, this doesn t present a security problem. Because the System account cannot log on interactively, you can t see or interact with programs run by the System account.
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