Azure Invoke-AzVMRunCommand - - azure

Question

I am wondering if there is way to use the Invoke-AzVMRunCommand to run a single command, rather than a powershell ps1 file?
As an example, I want to execute a single command... "C:\app\app.exe -c exit". Without the need to push a powershell commandlet to the system.
I am able to do this via the Azure Portal "RunPowerShellScript" and it works but would like to do it to multiple systems via the command line via Invoke-AzVMRunCommand. These systems do not share a command account that can be used.
According to Microsoft, here is the syntax...
Invoke-AzVMRunCommand -ResourceGroupName 'rgname' -VMName 'vmname' -CommandId 'RunPowerShellScript' -ScriptPath 'sample.ps1' -Parameter #{param1 = "var1"; param2 = "var2"}
I don't want to run a script, I merely want to be able to execute a command on the system. Is this possible?

Answer 1

There is no direct way of doing it. But, you can write a script block and generate a file from it and then run Invoke-AzVMRunCommand using that file and later on delete that file if required.
$Server = "server01"
[System.String]$ScriptBlock = {Get-Process}
$FileName = "RunScript.ps1"
Out-File -FilePath $FileName -InputObject $ScriptBlock -NoNewline
$vm = Get-AzVM -Name $Server
Invoke-AzVMRunCommand -ResourceGroupName $vm.ResourceGroupName -Name $Server -CommandId 'RunPowerShellScript' -ScriptPath $FileName
Remove-Item -Path $FileName -Force -ErrorAction SilentlyContinue

Answer 2

It's now possible to use the:
-ScriptString
... option, however you need to ensure that the Az version will support it.
Azure Pipelines as of 2022-07-21 don't support it:
"A parameter cannot be found that matches parameter name 'ScriptString'."
See the documentation:
https://learn.microsoft.com/en-us/powershell/module/az.compute/invoke-azvmruncommand?view=azps-8.1.0