Converting this code snippet from VBS to Powershell

Question

I have to convert this to Powershell:

On Error Resume Next

strComputer = "."

Set WshShell = CreateObject("WScript.Shell")
Set oEnv = WshShell.Environment("Process")
sScriptPath = Left(WScript.ScriptFullName, Len(WScript.ScriptFullName) - (Len(WScript.ScriptName) + 1))


    WshShell.run "MsiExec.exe /i " & Chr(34) & sScriptPath & "\Install.msi" & chr(34) & " Transforms=" & chr(34) & sScriptPath & "\Install.mst" & chr(34),0 , True

WScript.Quit(0)

What I know:

On Error Resume Next

is default in Powershell

Set WshShell = CreateObject("WScript.Shell")

is something like

$WshShell = New-Object -ComObject Wscript.Shell -Strict

Can I then do

$oEnv = $WshShell.Environment("Process")

What WScrip.ScriptFullName is the full path or the current script?

How do I call that WshShell.run command in Powershell?

Thanks man, however the Download this conversion guide leads to an unavailable page. Can I access it other ways? — Benjamin S. Sorterup
– Benjamin S. Sorterup, Commented Jul 29, 2016 at 8:49
Just read it online: the table of contents is in the left pane. — woxxom
– woxxom, Commented Jul 29, 2016 at 8:59

Ansgar Wiechers · Accepted Answer · 2016-07-29 20:45:20Z

1

In PowerShell you'd normally just use

$env:VARIABLE

instead of something convoluted like

$oEnv = (New-Object -COM WScript.Shell).Environment('Process')
$oEnv.Item('VARIABLE')

If you need to get a variable specifically from the "User", "Machine", or "Process" environment you'd use something like this:

[Environment]::GetEnvironmentVariable('VARIABLE', 'User')

The equivalent to WScript.ScriptFullName is $MyInvocation.MyCommand.Path (or $PSScriptRoot in more recent versions).

Instead of the Run method you'd use the call operator (&).

edited Jul 29, 2016 at 20:45

answered Jul 29, 2016 at 10:22

Ansgar Wiechers

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