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Powershell - concatenated command will not run

Posted on 2014-11-20
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Last Modified: 2014-11-20
I am trying to string together a Schtasks command (for task scheduler) in powershell.

Through multiple variables, I successfully create the following:

$ScheduleAdd = "Schtasks /create /tn " + $userAlias +"-Covering-" + $identityAlias + " /sc ONCE /SD " + $single_StartDate + " /st 00:01 " + "/tr " + $([char]34) + "Powershell -command " + $addScript + $([char]34)
	Write-Host $ScheduleAdd

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if I run "Write-Host $ScheduleAdd" after it in the script, it will successfully write to the console the exact command that can be copied and pasted into command prompt and run to create the scheduled task.

So I'm trying to figure out, why is it not actually adding the task to task scheduler when I set the variable above?

I can copy/paste it into the prompt and run it, and it adds, but if I don't copy paste the command, it will not add?

So Write-Host $ScheduleAdd will print out just like this:

Schtasks /create /tn TSmith-Covering-BJones /sc ONCE /SD 11-24-2014 /st 00:01 /tr "Powershell -command \\server\t$\schedules\Add-TSmith-Covering-BJones-11-24-2014.ps1"

It will print that out, but Powershell isn't executing it. I have to copy and paste it into the powershell window, and then it executes it, adding it to the scheduled tasks.
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Question by:garryshape
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Expert Comment

by:becraig
Comment Utility
Try invoke-expression
iex $ scheduleadd
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Author Comment

by:garryshape
Comment Utility
hmm doesn't appear to work. I am in a PSSession with Exchange but I don' think that's the problem.
other commands run fine

iex $ScheduleAdd

not sure
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Author Comment

by:garryshape
Comment Utility
I even tried invoke-expression -command $ScheduleAdd
also tried $string = $ScheduleAdd | Out-String
then iex $string

no luck.

haha it's so weird! I need help lol
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Author Comment

by:garryshape
Comment Utility
So I tried this:
$ScheduleAdd > "\\path\output.txt"

and that appears to be the same string that write-host displays into the text file.

Do I need to output to text file and then re-import for the command to run?
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LVL 28

Expert Comment

by:becraig
Comment Utility
This worked for me without issue:
$ScheduleAdd = "Schtasks /create /tn TSmith-Covering-BJones /sc ONCE /SD 11-24-2014 /st 00:01 /tr ""Powershell -command \\server\t$\schedules\Add-TSmith-Covering-BJones-11-24-2014.ps1"""
iex $ScheduleAdd

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Author Comment

by:garryshape
Comment Utility
Well I think the challenge is my $ScheduleAdd = has to be written out based on variables, so when I have multiple variables throughout the line, it starts to throw a fit because of all the quotes.

I'll try it out again and try the double quotes per your successful method
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LVL 28

Expert Comment

by:becraig
Comment Utility
It should work with no problem once you correctly escape your quotes etc.


Let me know if it works.
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Author Comment

by:garryshape
Comment Utility
LOL ok, well, it's adding the schedules to my task scheduler, not the computer I have a pssession against. I'm not sure why. I'll try adding the computer name, not sure if it's going to pass through the variables.
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Accepted Solution

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becraig earned 500 total points
Comment Utility
You should be able to do it remotely just by specifying the target computer.

Schtasks /s $computer

Above should work with all your other flags
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Author Comment

by:garryshape
Comment Utility
Ok so I can't invoke expression, that's for local computer.

tried invoke-command, didn't work. But invoke-command has the "-session $sessionname" option, and I added the session, but I can only call a .ps1 file with invoke-command, apparently, so now I have to put the scheduler command in a ps1 file. heh. trying it out
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Author Comment

by:garryshape
Comment Utility
Oh man awesome, the /S flag, had no idea, it worked. Thanks so much
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