Parameter Names That Cannot Be Used

📐 Rule.

PowerShell supplies a common set of parameters to every cmdlet, plus extras added in specific situations. You cannot define your own parameters with these reserved names.

Reserved names.

• Confirm
• Debug
• ErrorAction
• ErrorVariable
• OutBuffer
• OutVariable
• WarningAction
• WarningVariable
• WhatIf
• UseTransaction
• Verbose

Why.

These are the common parameter names. PowerShell owns them. Reusing one collides with the behavior the runtime already binds to that name.