powershell - Remove all variables

Question

I want to remove all user-created variables at the start of a script.

Currently I am doing Remove-Variable -Name * but it tries to dele

Answer 1

Instead of deleting all the user variables, start a fresh instance of PowerShell:

PS C:\> $x = 10
PS C:\> $y = 50
PS C:\> $blah = 'text'
PS C:\> Write-host $x $y $blah
10 50 text
PS C:\> powershell
Windows PowerShell
Copyright (C) 2009 Microsoft Corporation. All rights reserved.

PS C:\> Write-host $x $y $blah

PS C:\>

User defined variables won't carry over into the new instance.

PS C:\> $bleh = 'blue'
PS C:\> Write-Host $bleh
blue
PS C:\> exit
PS C:\> Write-host $bleh

PS C:\>

Your variables won't carry back over into the calling instance, either.

You have a few options in terms of how to actually accomplish this.

1. You can always start the new instance yourself, of course:

   powershell -ExecutionPolicy Unrestricted -File myscript

2. You could encode that command in a separate script and then only call that script, and not the companion one with the real code.