How to copy members from one security group to another security group in AD using PowerShell v4?

Question

I'm relatively new to PowerShell and am trying to learn it for a project at work involving Active Directory. The task I have is to compare the members of two different security groups in AD (both groups are located in the same OU) and copy the members from Group 2 that are not in Group 1 over to Group 1.

I came across this link that showed how to compare groups but:

1. The code segment listed on this website returns both the members from Group 1 that aren't in Group 2 and the members from Group 2 that aren't in Group 1 which is way more information than I need
2. Once I get the list I don't know how to use that to enter into a command or script to copy those members to the appropriate group.

Answer 1

Here you go. Try the below script which I have written for your requirement.

#Input Parameters. Change these as per your requirement
$group1 = "Group1Name"
$group2 = "Group2Name"

$membersInGroup1 = Get-ADGroupMember $group1
$membersInGroup2 = Get-ADGroupMember $group2

if($membersInGroup1 -eq $null)
{
    Add-ADGroupMember -Identity $group1 -Members $membersInGroup2
}
elseif($membersInGroup2 -ne $null)
{
  $separateMembers = diff $membersInGroup1 $membersInGroup2

  if($separateMembers -ne $null)
  {
    foreach($member in $separateMembers)
    {
      $currentUserToAdd = Get-ADUser -Identity $member.InputObject
      Add-ADGroupMember -Identity $group1 -Members $currentUserToAdd
      }
  }
}

Let me know if you face any issues.