QnD-Unix-ADUser.ps1

param (
    [Parameter(Mandatory=$true)]
    [string]$UserName
)

$uidNumber = [int](Get-ADUser -LDAPFilter "(uidNumber=*)" -Properties uidNumber | Sort-Object -Descending -Property uidNumber)[0].uidNumber + 1

$user = Get-ADUser $UserName -Properties uidNumber
if(($user) -and (-not $user.uidNumber)) {
    "Unix enabling user: $($user.Name) with uidNumber: $uidNUmber"
    $user | Set-ADUser -Replace @{"uidNumber"=$uidNumber;"unixHomedirectory"="/home/$($user.samaccountname)";"loginShell"="/bin/bash";"gecos"="$($user.Name)";"gidNumber"=513}
    Get-ADUser -LDAPFilter "(uidNumber=$uidNumber)" -Properties gecos,uidNumber,unixHomeDirectory,loginShell,gidNumber
}