Get-ADExistence.ps1

<#
.Synopsis
   Checks if computer account exists for computer names provided
.DESCRIPTION
   Checks if computer account exists for computer names provided
.EXAMPLE
   Get-ADExistence $computers
.EXAMPLE
   Get-ADExistence "computer1","computer2"
#>
function Get-ADExistence
{
    [CmdletBinding()]
    Param
    (
        # single or array of machine names
        [Parameter(Mandatory=$true,
                   ValueFromPipeline=$true,
                   ValueFromPipelineByPropertyName=$true,
                   HelpMessage="Enter one or multiple computer names")]
        [String[]]$Computers
     )
    Begin{}
    Process {
        foreach ($computer in $computers) {
            try {
                $comp = get-adcomputer $computer -ErrorAction stop
                $properties = @{computername = $computer
                                Enabled = $comp.enabled
                                InAD = 'Yes'}
            } 
            catch {
                $properties = @{computername = $computer
                                Enabled = 'Fat Chance'
                                InAD = 'No'}
            } 
            finally {
                $obj = New-Object -TypeName psobject -Property $properties
                Write-Output $obj
            }
        } #End foreach

    } #End Process
    End{}
} #End Function