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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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LVL 29

Expert Comment

by:becraig
ID: 40456578
Try invoke-expression
iex $ scheduleadd
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Author Comment

by:garryshape
ID: 40456584
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
ID: 40456595
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
ID: 40456648
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 29

Expert Comment

by:becraig
ID: 40456687
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
ID: 40456689
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 29

Expert Comment

by:becraig
ID: 40456691
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
ID: 40456706
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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LVL 29

Accepted Solution

by:
becraig earned 500 total points
ID: 40456719
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
ID: 40456724
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
ID: 40456729
Oh man awesome, the /S flag, had no idea, it worked. Thanks so much
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