Finding PowerShell Default Variables (Part 1)

Sometimes it would be useful to identify the automatic PowerShell variables managed by PowerShell so you could differentiate between built-in variables and your own. Get-Variable always dumps all variables.

Here is a simple trick that uses a separate new and fresh PowerShell runspace to determine the built-in PowerShell variables:

# create a new PowerShell
$ps = [PowerShell]::Create()
# get all variables inside of it
$null = $ps.AddCommand('Get-Variable')
$result = $ps.Invoke()
# dispose new PowerShell
$ps.Runspace.Close()
$ps.Dispose()

# check results
$varCount = $result.Count
Write-Warning "Found $varCount variables."
$result | Out-GridView

When you run this, the code reports the number of found variables, and the variables.

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