Get-NestedMember

Get-NestedMember.ps1

function Get-NestedMember
{
<#
    .SYNOPSIS
        Find all Nested members of a group
    .DESCRIPTION
        Find all Nested members of a group
    .PARAMETER GroupName
        Specify one or more GroupName to audit
    .Example
        Get-NestedMember -GroupName TESTGROUP
    .Example
        Get-NestedMember -GroupName TESTGROUP,TESTGROUP2
#>
    [CmdletBinding()]
    PARAM(
    [String[]]$GroupName)
    BEGIN 
    {
        TRY{
            if(-not(Get-Module Activedirectory -ErrorAction Stop)){
                Write-Verbose -Message "[BEGIN] Loading ActiveDirectory Module"
                Import-Module ActiveDirectory -ErrorAction Stop}
        }
        CATCH
        {
            Write-Warning -Message "[BEGIN] An Error occured"
            Write-Warning -Message $error[0].exception.message
        }
    }
    PROCESS
    {
        TRY
        {
            FOREACH ($Group in $GroupName)
            {
                $GroupObject = Get-ADGroup -Identity $Group -ErrorAction Stop

                IF($GroupObject)
                {
                    $GroupObject | Get-ADGroupMember -ErrorAction Stop | ForEach-Object -Process {

                        $ParentGroup = $GroupObject.Name
                        Write-Verbose -Message "[PROCESS] Name:$($_.name) | ObjectClass:$($_.ObjectClass)"
                        $CurrentObject = $_
                        switch ($_.ObjectClass)
                        {   
                            "user" { $CurrentObject | Select-Object Name,SamAccountName,ObjectClass,DistinguishedName,@{L="ParentGroup";E={$ParentGroup}}}
                            "computer" { $CurrentObject | Select-Object Name,SamAccountName,ObjectClass,DistinguishedName, @{L="ParentGroup";E={$ParentGroup}}}
                            "contact" { $CurrentObject | Select-Object Name,SamAccountName,ObjectClass,DistinguishedName, @{L="ParentGroup";E={$ParentGroup}}}
                            "group" {
                                # Output Object
                                $CurrentObject | Select-Object Name,SamAccountName,ObjectClass,DistinguishedName, @{L="ParentGroup";E={$ParentGroup}}

                                # Find Child
                                Get-NestedMember -GroupName $CurrentObject.Name

                                }#Group
                        }#Switch
                    }#ForeachObject
                }#IF($GroupObject)
                ELSE {
                    Write-Warning -Message "[PROCESS] Can't find the group $Group"
                }#ELSE
            }#FOREACH ($Group in $GroupName)
        }#TRY
        CATCH{
            Write-Warning -Message "[PROCESS] An Error occured"
            Write-Warning -Message $error[0].exception.message }
    }#PROCESS
    END
    {
        Write-Verbose -Message "[END] Get-NestedMember"
    }
}