functions/Remove-DbaClientAlias.ps1

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Function Remove-DbaClientAlias {
<#
 .SYNOPSIS
 Removes a sql alias for the specified server - mimics cliconfg.exe
 
 .DESCRIPTION
 Removes a SQL Server alias by altering HKLM:\SOFTWARE\Microsoft\MSSQLServer\Client
 
 .PARAMETER ComputerName
 The target computer where the alias will be created
 
 .PARAMETER Credential
 Allows you to login to remote computers using alternative credentials
 
 .PARAMETER Alias
 The alias to be deleted
  
 .PARAMETER EnableException
 By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.
 This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.
 Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.
  
 .NOTES
 Tags: Alias
 
 Website: https://dbatools.io
 Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
 License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
 
 .LINK
 https://dbatools.io/Remove-DbaClientAlias
 
 .EXAMPLE
 Remove-DbaClientAlias -ComputerName workstationx -Alias sqlps
 Removes the sqlps SQL client alias on workstationx
 
 .EXAMPLE
 Get-DbaClientAlias | Remove-DbaClientAlias
 Removes all SQL Server client aliases on the local computer
 
#>

    [CmdletBinding()]
    Param (
        [parameter(ValueFromPipelineByPropertyName)]
        [DbaInstanceParameter[]]$ComputerName = $env:COMPUTERNAME,
        [PSCredential]$Credential,
        [parameter(Mandatory, ValueFromPipelineByPropertyName)]
        [Alias('AliasName')]
        [string]$Alias,
        [switch][Alias('Silent')]$EnableException
    )
    
    process {
        
        foreach ($computer in $ComputerName) {
            $null = Test-ElevationRequirement -ComputerName $computer -Continue
            
            $scriptblock = {
                $Alias = $args[0]
                function Get-ItemPropertyValue {
                    Param (
                        [parameter()]
                        [String]$Path,
                        [parameter()]
                        [String]$Name
                    )
                    Get-ItemProperty -LiteralPath $Path -Name $Name
                }
                
                $basekeys = "HKLM:\SOFTWARE\WOW6432Node\Microsoft\MSSQLServer", "HKLM:\SOFTWARE\Microsoft\MSSQLServer"
                
                foreach ($basekey in $basekeys) {
                    
                    if ((Test-Path $basekey) -eq $false) {
                        Write-Warning "Base key ($basekey) does not exist. Quitting."
                        continue
                    }
                    
                    $client = "$basekey\Client"
                    
                    if ((Test-Path $client) -eq $false) {
                        continue
                    }
                    
                    $connect = "$client\ConnectTo"
                    
                    if ((Test-Path $connect) -eq $false) {
                        continue
                    }
                    
                    if ($basekey -like "*WOW64*") {
                        $architecture = "32-bit"
                    }
                    else {
                        $architecture = "64-bit"
                    }
                    
                    
                    $all = Get-Item -Path $connect
                    foreach ($entry in $all) {
                        
                        foreach ($en in $entry) {
                            $e = $entry.ToString().Replace('HKEY_LOCAL_MACHINE', 'HKLM:\')
                            if ($en.Property -contains $Alias) {
                                Remove-ItemProperty -Path $e -Name $Alias
                            }
                            else {
                                $en
                            }
                        }
                    }
                }
            }
            
            if ($PScmdlet.ShouldProcess($computer, "Getting aliases")) {
                try {
                    $null = Invoke-Command2 -ComputerName $computer -Credential $Credential -ScriptBlock $scriptblock -ErrorAction Stop -Verbose:$false -ArgumentList $Alias
                    Get-DbaClientAlias -ComputerName $computer
                    
                }
                catch {
                    Stop-Function -Message "Failure" -ErrorRecord $_ -Target $computer -Continue
                }
            }
        }
    }
}