Question

I have a script that may be run manually or may be run by a scheduled task. I need to programmatically determine if I’m running in -noninteractive mode (which is set when run via scheduled task) or normal mode. I’ve googled around and the best I can find is to add a command line parameter, but I don’t have any feasible way of doing that with the scheduled tasks nor can I reasonably expect the users to add the parameter when they run it manually.
Does noninteractive mode set some kind of variable or something I could check for in my script?

Edit:
I actually inadvertently answered my own question but I’m leaving it here for posterity.

I stuck a read-host in the script to ask the user for something and when it ran in noninteractive mode, boom, terminating error. Stuck it in a try/catch block and do stuff based on what mode I’m in.

Not the prettiest code structure, but it works. If anyone else has a better way please add it!

Answer 1

You can check how powershell was called using Get-WmiObject for WMI objects:

(gwmi win32_process | ? { $_.processname -eq "powershell.exe" }) | select commandline

#commandline
#-----------
#"C:\WINDOWS\system32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -NonInteractive

---

UPDATE: 2020-10-08

Starting in PowerShell 3.0, this cmdlet has been superseded by Get-CimInstance

(Get-CimInstance win32_process -Filter "ProcessID=$PID" | ? { $_.processname -eq "pwsh.exe" }) | select commandline

#commandline
#-----------
#"C:\Program Files\PowerShell\6\pwsh.exe"