Adding a second trigger in task schedule

问题:

Have a powershell script that will create a scheduled task, for deployment, by way of Octopus, to a Windows 2012 server.

Function Create-ScheduledTask($TaskName,$RunAsUser,$TaskRun,$Schedule,$StartTime,$StartDate,$Arguments,$RunWithElevatedPermissions,$Days,$Password){
    # set up
    $Command = "schtasks.exe /create /ru `"$RunAsUser`" /tn `"$TaskName`" /tr `"'$($TaskRun)' $Arguments`" $cmdSchedule $cmdDays $cmdStartDate $cmdStartTime /F $cmdInterval $cmdDuration $cmdRunLevel $cmdPassword"

    echo $Command
    Invoke-Expression $Command            
 }

Attempting to add another trigger as part of the same taskname, on the command line, will not work with schtasks.exe which seemingly contradicts the GUI where it can be done.

This is the function that was used to create the event trigger, ideally, to attach that to the same scheduled task.

Function Create-ScheduledTaskEvent($TaskName,$RunAsUser,$TaskRun,$Arguments,$RunWithElevatedPermissions,$Password, $xPath, $channelName){

    $cmdRunLevel = if(-Not $RunWithElevatedPermissions){""}else{"/rl HIGHEST"}
    $cmdPassword = if([string]::IsNullOrEmpty($Password)){""}else{"/rp `"$Password`""}
    $cmdXPath = if([string]::IsNullOrEmpty($xPath)){""}else{"/sc ONEVENT /MO `"$xPath`" "}
    $cmdRunLevel = if(-Not $RunWithElevatedPermissions){""}else{"/rl HIGHEST"}

    $Command = "schtasks.exe /create $cmdRunLevel /ru `"$RunAsUser`" $cmdXPath /tn `"$TaskName`" /tr `"'$($TaskRun)' $Arguments`" /ec `"$channelName`" "

    echo $Command          
    Invoke-Expression $Command            
 }

Issue is, replacing the switch /create with /change only ends up clobbering the previous scheduled task's trigger/action.

Any idea how can this be done by way of schtasks.exe on the command-line, to combine the triggers into one.

It could be done by creating a separate task schedule with different taskname, it is not ideal though, nor is exporting out task as xml and then importing back in.

回答1:

schtasks.exe won't allow you to do this via basic switches. In order to be able to do this with schtasks.exe you can use an XML import, of an existing task, as mentioned on SU.

Take an export of an existing task with the trigger set you want that you can import later. PowerShell can also natively understand xml files via the [xml] cast and Select-XML so you are not limited to static XML files but can also make changes on the fly to existing ones if you wanted.

Depending on what system you are working from you can also have access to the PowerShell task manipulation cmdlets like Register-ScheduledTask which does allow multiple tasks to be configured. These can be found on Windows Server 2012 R2 and Windows 8.1. To pull a small snippet from TechTarget

$triggers = @()
$triggers += New-ScheduledTaskTrigger -Daily -At 03:00
$triggers += New-ScheduledTaskTrigger -Daily -At 09:00
$triggers += New-ScheduledTaskTrigger -Daily -At 15:00
$triggers += New-ScheduledTaskTrigger -Daily -At 21:00

#..... code truncated to only show trigger portion

$action = New-ScheduledTaskAction -Execute $pstart -Argument $actionscript
Register-ScheduledTask -TaskName $taskname -Action $action -Trigger $triggers -RunLevel Highest -Description “Test job”

Since you tagged 2012 you might be able to run those cmdlets in a PSSession from your own system if it is not 8.1

回答2:

I have similar task and most elegant solution that I found was to create the schedule task at test environment /local PC using the GUI and export it as XML. Then copy the XML formatted text and embedded it into the script, after execution the script save this string block as XML file locally and run schtasks.exe to create the new task.

schtasks.exe /create /RU "NT AUTHORITY\SYSTEM" /TN TaskName /XML "XMLFolder\TaskName.xml"