PowerShell Remove all user defined variable in PowerShell

When PS scripts executes, it is possibly create much user defined variables.

So, sometimes these varibales may confuse us a lot.

Here's a workaound:

Most of the standard variables can be found in System.Management.Automation.SpecialVariables. If you filter out these and a small list of other known variables, you can create a reusable function to get user-defined variables:

function Get-UDVariable {
get-variable | where-object {(@(
"FormatEnumerationLimit",
"MaximumAliasCount",
"MaximumDriveCount",
"MaximumErrorCount",
"MaximumFunctionCount",
"MaximumVariableCount",
"PGHome",
"PGSE",
"PGUICulture",
"PGVersionTable",
"PROFILE",
"PSSessionOption"
) -notcontains $_.name) -and `
(([psobject].Assembly.GetType('System.Management.Automation.SpecialVariables').GetFields('NonPublic,Static') | Where-Object FieldType -eq ([string]) | ForEach-Object GetValue $null)) -notcontains $_.name
}
}

in your script, just use :

Get-UDVariable | Remove-Variable

One more suggestion:

I don't think it will be the best solution to solve problems made by remaining varibales.

When we create varibale in our scripts, we should have a think that what is the proper scope ?

MSDN ref : https://technet.microsoft.com/en-us/library/hh847849.aspx

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