Public/Get-RegKey.ps1

function Get-RegKey
{

    <#
    .SYNOPSIS
           Gets the registry keys on local or remote computers.
 
    .DESCRIPTION
           Use Get-RegKey to get registry keys on local or remote computers
            
    .PARAMETER ComputerName
            An array of computer names. The default is the local computer.
 
    .PARAMETER Hive
           The HKEY to open, from the RegistryHive enumeration. The default is 'LocalMachine'.
           Possible values:
            
        - ClassesRoot
        - CurrentUser
        - LocalMachine
        - Users
        - PerformanceData
        - CurrentConfig
        - DynData
 
    .PARAMETER Key
           The path of the registry key to open.
 
    .PARAMETER Name
           The name of the registry key, Wildcards are permitted.
         
    .PARAMETER Recurse
           Gets the registry values of the specified registry key and its sub keys.
 
    .PARAMETER Ping
           Use ping to test if the machine is available before connecting to it.
           If the machine is not responding to the test a warning message is output.
               
    .EXAMPLE
        Get-RegKey -Key SOFTWARE\Microsoft\PowerShell\1 -Name p*
 
        ComputerName Hive Key SubKeyCount ValueCount
        ------------ ---- --- ----------- ----------
        COMPUTER1 LocalMachine SOFTWARE\Microsoft\PowerShell\1\PowerShellEngine 0 6
        COMPUTER1 LocalMachine SOFTWARE\Microsoft\PowerShell\1\PowerShellSnapIns 5 0
        COMPUTER1 LocalMachine SOFTWARE\Microsoft\PowerShell\1\PSConfigurationProviders 1 0
 
            
           Description
           -----------
           Gets all keys from the PowerShell subkey on the local computer with names starts with the letter 'p'.
 
    .EXAMPLE
        Get-RegKey -Key SOFTWARE\Microsoft\PowerShell\1 -Name p* -Recurse
 
        ComputerName Hive Key SubKeyCount ValueCount
        ------------ ---- --- ----------- ----------
        COMPUTER1 LocalMachine SOFTWARE\Microsoft\PowerShell\1\PowerShellEngine 0 6
        COMPUTER1 LocalMachine SOFTWARE\Microsoft\PowerShell\1\PowerShellSnapIns 5 0
        COMPUTER1 LocalMachine SOFTWARE\Microsoft\PowerShell\1\PowerShellSnapIns\PowerGUI_Pro 0 7
        COMPUTER1 LocalMachine SOFTWARE\Microsoft\PowerShell\1\PSConfigurationProviders 1 0
 
           Description
           -----------
           Gets all keys and subkeys from the PowerShell subkey on the local computer with names starts with the letter 'p'.
 
    .EXAMPLE
        Get-RegKey -ComputerName SERVER1 -Key SOFTWARE\Microsoft\PowerShell\1 -Name p* | Get-RegValue
 
        ComputerName Hive Key Value Data Type
        ------------ ---- --- ----- ---- ----
        SERVER1 LocalMachine SOFTWARE\Microsof... ApplicationBase C:\Windows\System... String
        SERVER1 LocalMachine SOFTWARE\Microsof... PSCompatibleVersion 1.0, 2.0 String
        SERVER1 LocalMachine SOFTWARE\Microsof... RuntimeVersion v2.0.50727 String
        SERVER1 LocalMachine SOFTWARE\Microsof... ConsoleHostAssemblyName Microsoft.PowerSh... String
        SERVER1 LocalMachine SOFTWARE\Microsof... ConsoleHostModuleName C:\Windows\System... String
        SERVER1 LocalMachine SOFTWARE\Microsof... PowerShellVersion 2.0 String
 
           Description
           -----------
           Gets all keys and subkeys from the PowerShell subkey on the remote server SERVER1 with names starts with the letter 'p'.
           Pipe the results to Get-RegValue to get all value types under these keys.
 
    .OUTPUTS
        PSFanatic.Registry.RegistryKey (PSCustomObject)
 
    .NOTES
        Author: Shay Levy
        Blog : http://blogs.microsoft.co.il/blogs/ScriptFanatic/
         
    .LINK
        http://code.msdn.microsoft.com/PSRemoteRegistry
 
    .LINK
        New-RegKey
        Remove-RegKey
        Test-RegKey
 
    #>

        

    [OutputType('PSFanatic.Registry.RegistryKey')]
    [CmdletBinding(DefaultParameterSetName="__AllParameterSets")]
    
    param( 
        [Parameter(
            Position=0,
            ValueFromPipeline=$true,
            ValueFromPipelineByPropertyName=$true
        )]        
        [Alias("CN","__SERVER","IPAddress")]
        [string[]]$ComputerName="",        

        [Parameter(
            Position=1,
            ValueFromPipelineByPropertyName=$true,
            HelpMessage="The HKEY to open, from the RegistryHive enumeration. The default is 'LocalMachine'."
        )]
        [ValidateSet("ClassesRoot","CurrentUser","LocalMachine","Users","PerformanceData","CurrentConfig","DynData")]
        [string]$Hive="LocalMachine",

        [Parameter(
            Mandatory=$true,
            Position=2,
            ValueFromPipelineByPropertyName=$true,
            HelpMessage="The path of the subkey to open."
        )]
        [string]$Key,
        
        [Parameter(
            Mandatory=$false,
            Position=3,
            ValueFromPipelineByPropertyName=$true,
            HelpMessage="The name of the value to set."
        )]    
        [string]$Name="*",        
    
        [switch]$Ping,
        
        [switch]$Recurse
    ) 

    begin
    {
        Write-Verbose "Enter begin block..."
    
        function Recurse($Key){
        
            Write-Verbose "Start recursing, key is [$Key]"

            try
            {
            
                $subKey = $reg.OpenSubKey($key)
                
                if(!$subKey)
                {
                    Throw "Key '$Key' doesn't exist."
                }
                
            
                foreach ($k in $subKey.GetSubKeyNames())
                {                            
                    if($k -like $Name)
                    {
                        $child = $subKey.OpenSubKey($k)
                        $pso = New-Object PSObject -Property @{
                            ComputerName=$c
                            Hive=$Hive
                            Key="$Key\$k"                                
                            ValueCount=$child.ValueCount
                            SubKeyCount=$child.SubKeyCount
                        }

                        Write-Verbose "Recurse: Adding format type name to custom object."
                        $pso.PSTypeNames.Clear()
                        $pso.PSTypeNames.Add('PSFanatic.Registry.RegistryKey')
                        $pso
                    }
                        
                    Recurse "$Key\$k"        
                }
                
            }
            catch
            {
                Write-Error $_
            }
            
            Write-Verbose "Ending recurse, key is [$Key]"
        }
        
        Write-Verbose "Exit begin block..."
    }
    

    process
    {


            Write-Verbose "Enter process block..."
        
        foreach($c in $ComputerName)
        {    
            try
            {                
                if($c -eq "")
                {
                    $c=$env:COMPUTERNAME
                    Write-Verbose "Parameter [ComputerName] is not presnet, setting its value to local computer name: [$c]."
                    
                }
                
                if($Ping)
                {
                    Write-Verbose "Parameter [Ping] is presnet, initiating Ping test"
                    
                    if( !(Test-Connection -ComputerName $c -Count 1 -Quiet))
                    {
                        Write-Warning "[$c] doesn't respond to ping."
                        return
                    }
                }
                
                
                Write-Verbose "Starting remote registry connection against: [$c]."
                Write-Verbose "Registry Hive is: [$Hive]."
                $reg = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey([Microsoft.Win32.RegistryHive]$Hive,$c)        
    
                                
                if($Recurse)
                {
                    Write-Verbose "Parameter [Recurse] is presnet, calling Recurse function."
                    Recurse $Key
                }
                else
                {                    
                
                    Write-Verbose "Open remote subkey: [$Key]."            
                    $subKey = $reg.OpenSubKey($Key)
                    
                    if(!$subKey)
                    {
                        Throw "Key '$Key' doesn't exist."
                    }
                    
                    Write-Verbose "Start get remote subkey: [$Key] keys."
                    foreach ($k in $subKey.GetSubKeyNames())
                    {
                        if($k -like $Name)
                        {                        
                            $child = $subKey.OpenSubKey($k)
                            $pso = New-Object PSObject -Property @{
                                ComputerName=$c
                                Hive=$Hive
                                Key="$Key\$k"                                
                                ValueCount=$child.ValueCount
                                SubKeyCount=$child.SubKeyCount
                            }

                            Write-Verbose "Recurse: Adding format type name to custom object."
                            $pso.PSTypeNames.Clear()
                            $pso.PSTypeNames.Add('PSFanatic.Registry.RegistryKey')
                            $pso
                        }
                    }                
                }
                
                Write-Verbose "Closing remote registry connection on: [$c]."
                $reg.close()
            }
            catch
            {
                Write-Error $_
            }
        } 
    
        Write-Verbose "Exit process block..."
    }
}