PowerShell Remove all user defined variable in PowerShell

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

So, sometimes these varibales could confuse us a lot.

Here's a workaound:

Most of the variables can is 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

functionget-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'll be the best solution to solve problems made by remaining varibales.

When we are create varibale in our scripts, we should has a think what's the proper scope?

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

PowerShell Remove all user defined variable in PowerShell