Need a powershell script to add multiple users to multiple groups

This Powershell script should do the trick.

# Add users to groups
Param ($infile)

$userlist = Import-CSV -Path $infile

$stream = [System.IO.StreamWriter] "users_not_found.txt"

foreach ($user in $userlist)
{
  $userid = $user.samAccountName
  $userobj = Get-ADUser $userid
  if ($userid) {
     $group = $user.Groupname
     Add-ADGroupMember -Identity $group -Members $userid
  }
  else {
    write-output "$userid not found"
    $stream.WriteLine("$userid not found")
  }
}
$stream.Close()

I believe you want to add each listed user in csv to all groups in csv, right?

I mean there is no mapping required between each user and corresponding group in csv file ?

If you want user1 to be added to all groups (group1 to GroupN), then I would split the CSV file into two files. A list of users and a list of groups.
Then do a nested for next loop, the outer one to process a group at a time, and an inner loop to process all the users for that group and add the user to the group.
If you want me to update the code, let me know.

Mahesh,

This is what i am expecting from the script.

Samaccountname                  Group

User1                                        Group1
User2                                        Group2
User3                                        Group3
User4                                        Group4
.                                                  .
.                                                  .
.                                                  .
User N                                    Group N

User 1 should get added in all the groups i.e from Group1  till Group N and same goes to all other users as well. Basically, every user should be added in all the groups.

Let me know if any other info is required.

Thanks

Thanks Mahesh. It worked!!