Create scheduled task via PowerShell

[Dave Lum]

Sounds easy, until two ingredients are added.

 

1. Needs to use a gMSA account, which forces using PowerShell and not the UI (ok not a big deal really)
2. I want it to run daily (so you’d think use the -Daily option) but also every hour for the next 16 hours (which means -RepetitionInterval, which is not available if using the -Daily option)

 

I have a task I want to start at 4am, run every hour using gMSA credentials, then stop at 8pm.  Rinse and repeat.

 

I found a Reddit post that says modify the task after registering it, but the way they formatted their code I didn’t understand it, but maybe that’s due to Friday brain.
https://www.reddit.com/r/PowerShell/comments/8vjpzq/registerscheduledtask_using_daily_and_repetition/

Dave

 

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[Michael B. Smith]

I would schedule this to run every hour of every day and if it’s not between 4am and 8pm to terminate without doing anything.

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[uj...@pdx.edu]

I have at least one of those - runs hourly M-F but only between 6:50am and 7:50pm, and uses gMSA. 

Create a -ONCE type repetition trigger and then copy the repetition part to the -Daily or -Weekly trigger object.

I keep these register job scripts in the script folder so I can change the parameters if needed and rerun to update the schedule.  This one is running scheduling a powershell script, but can adjust $action as needed.

RegisterScheduledJob.ps1

$ServiceAccount = "gMSAAccountName"
$TaskName = "TaskName"
$TaskPath = "Container\SubContainer"
$action = New-ScheduledTaskAction  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -Argument "-noprofile -noninteractive -executionpolicy bypass -file `"$PSScriptRoot\Script.ps1`"" -WorkingDirectory $PSScriptRoot
$trigger = New-ScheduledTaskTrigger -Weekly -DaysOfWeek Monday,Tuesday,Wednesday,Thursday,Friday  -At 6:50am

#need this to add a repeat option to a create a repetition schedule to add to a weekly or daily trigger as only the ONCE takes -RepetitionInterval and -RepetitionDuration
$repeat_trigger = New-ScheduledTaskTrigger -once -At 6:50am -RepetitionInterval (New-TimeSpan -Hours 1) -RepetitionDuration (New-TimeSpan -hours 13)
$trigger.Repetition = $repeat_trigger.Repetition

$principal = New-ScheduledTaskPrincipal -UserID "Domain\$ServiceAccount`$" -LogonType Password -RunLevel Highest
$settings = New-ScheduledTaskSettingsSet -ExecutionTimeLimit (New-TimeSpan -Hours 2) -AllowStartIfOnBatteries:$true -Disable:$false
Register-ScheduledTask -TaskName $TaskName -Action $action -Trigger $trigger -Principal $principal -Settings $settings -TaskPath $TaskPath -Force

[Dave Lum]

Oh brilliant, thanks!

 

From: ntsys...@googlegroups.com <ntsys...@googlegroups.com> On Behalf Of uj...@pdx.edu
Sent: Friday, December 20, 2024 1:37 PM
To: ntsysadmin <ntsys...@googlegroups.com>
Subject: [ntsysadmin] Re: Create scheduled task via PowerShell

 

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