How to echo predefined variable from PowerShell command line?

Question

I'm able to Write-Host a custom variable from PowerShell command line, but predefined variables are not working with same way.

What is proper way to echo a predefined variable.

Write-Host $path works.
Write-Host $PSScriptRoot does not.

Here is my code.

powershell.exe -ExecutionPolicy ByPass -Command "& { $path = """test"""; Write-Host $path; Write-Host $PSScriptRoot; }"

I would like to have parent directory of current script as variable.

Something like this $RootPath = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent.

$PSScriptRoot is defined for scripts in files. You're not running a file-based script, so $PSScriptRoot is empty. If you want the current directory, use pwd or [Environment]::CurrentDirectory (depending on whether you want PowerShell's opinion, or the operating system's opinion). — Jeroen Mostert
– Jeroen Mostert, Commented Sep 4, 2017 at 15:21
@JeroenMostert would you please provide an example for both? — Denix
– Denix, Commented Sep 4, 2017 at 15:23
Write-Host (Split-Path (pwd) -Parent)? Or set a variable first: $path = pwd. This is a basic case of using a cmdlet's output as input for another cmdlet. — Jeroen Mostert
– Jeroen Mostert, Commented Sep 4, 2017 at 15:28
@JeroenMostert I was seaching this solution more than 3 hours. I really appreciated. — Denix
– Denix, Commented Sep 4, 2017 at 15:43

Sid · Accepted Answer · 2017-09-05 07:15:11Z

2

If current location is what you want, this has always worked for me.

(Get-Location).path

If you also want to know for other predefined variables, Write host should work.

Get-Variable or simply Variable will display all predefined variables. If you look at $PSScriptroot, you will realize that it is empty. That is why it doesn't seem to be working for you.

answered Sep 5, 2017 at 7:15

Sid

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