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Can parameters be optional and mandatory at the same time? They can, based on context.
A parameter can be mandatory when other parameters are present, and optional otherwise.
function Connect-Somewhere { [CmdletBinding(DefaultParameterSetName='A')] param ( [Parameter(ParameterSetName='A',Mandatory=$false)] [Parameter(ParameterSetName='B',Mandatory=$true)] $ComputerName, [Parameter(ParameterSetName='B',Mandatory=$false)] $Credential ) $chosen = $PSCmdlet.ParameterSetName "You have chosen $chosen parameter set." } # -Computername is optional Connect-Somewhere # here, -Computername is mandatory Connect-Somewhere -Credential test
