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Wednesday, November 02, 2005


Setting the Path / system variables from MSH

Setting the Path from MSH,

as Path is an internal CMD command, the path command will not work in MSH

No Problem you would think, I do it like this :

$env:path = $env:path + ";c:\mytest"

but if you then close MSH and start it again its gone because te variable is set only for the current session.

I did remember the good old Wscript.shell trick for this :
( Exually, it was the other way around, I used this as an answer to a NG post, and wanted to look how MSH would handle this(setting system Variables), as I had some issues with this before. that's where that path adventure started ;-))

Set WshShell = WScript.CreateObject("WScript.Shell")
Set Env = WshShell.Environment("SYSTEM")
Env("Path") = Env("Path") & ";c:\mytest"

(you can also use User, Volatile, or Process as scope here)

so, no problem

$env = (new-object -com "WScript.Shell").Environment("SYSTEM")

but :

MSH > $env = (new-object -com "WScript.Shell").Environment("SYSTEM")
MSH> $env gm
TypeName: System.String

Oops I get a string back, so I can not set it from MSH.

Ok then use WMI :

$env = get-WMIObject win32_environment -filter "Name = 'Path'"MSH
$env.VariableValue = $env.VariableValue + ";c:\test"

Yes, this Works, at least I don't have to do the Registry trick :

( setting HKLM\System\CurrentControlSet\Control\Sessionmanager\Environment)
but this gets not updated while running.

only problem here is I don't have a create method in the WMI class.

gr /\/\o\/\/

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