Check for duplicate - ADUsers in bulk - powershell

Question

I am trying to make a PowerShell script to add users in bulk through a csv file. If the username already exists I want to add the number 1 to the username. How can I do this? I thought I could maybe make an if?
foreach ($User in $ADUsers) {
# Selvlagde variabler for opprettelse av brukere
$Password = Get-RandomCharacters -length 20 -characters 'ABCDEFGHKLMNOPRSTUVWXYZabcdefghiklmnoprstuvwxyz1234567890!._?/-'
$Username = $User.GivenName.substring(0,3) + $User.SurName.substring(0,3)
$Username = $Username.Replace('æ','ae')
$Username = $Username.Replace('ø','o')
$Username = $Username.Replace('å','aa')
$Username = $Username.ToLower()
$Username = $Username.Trim()
$Email = $Username + '#ONPremiumIT.com'
$DisplayName = $User.GivenName + ' ' + $User.SurName
if (condition) {
}
# Bruker splatting for å lagre info om brukere
$userParams = #{
Path = $User.Path
SamAccountName = $Username
UserPrincipalName = $Email
Name = "$($User.GivenName) $($User.SurName)"
GivenName = $User.GivenName
Surname = $User.SurName
Enabled = $true
ChangePasswordAtLogon = $false
DisplayName = $Displayname
Department = $Department
AccountPassword = (ConvertTo-SecureString $Password -AsPlainText -Force)
}
New-ADUser #userParams

Answer 1

You can do that by testing if a user with that SamAccountName already exists. Something like this:
foreach ($User in $ADUsers) {
# Selvlagde variabler for opprettelse av brukere
$Password = Get-RandomCharacters -length 20 -characters 'ABCDEFGHKLMNOPRSTUVWXYZabcdefghiklmnoprstuvwxyz1234567890!._?/-'
$Username = $User.GivenName.substring(0,3) + $User.SurName.substring(0,3)
$Username = $Username.Replace('æ','ae')
$Username = $Username.Replace('ø','o')
$Username = $Username.Replace('å','aa')
$Username = $Username.ToLower()
$Username = $Username.Trim()
# test if a user with that SamAccountName already exists, add an index number if needed
$n = 1 # start index at 1
$newName = $Username # copy to a new variable
while ($true) { # start an endless loop
$usr = Get-ADUser -Filter "SamAccountName -eq '$newName'" -ErrorAction SilentlyContinue
if (!$usr) {
$Username = $newName # assign the $Username variable the unique value
break # exit the loop if the $username is unique in the domain
}
# construct a new username by adding the index to it
$newName = '{0}{1}' -f $Username, $n++
}
$Email = $Username + '#ONPremiumIT.com'
$DisplayName = $User.GivenName + ' ' + $User.SurName
# Bruker splatting for å lagre info om brukere
$userParams = #{
Path = $User.Path
SamAccountName = $Username
UserPrincipalName = $Email
Name = "$($User.GivenName) $($User.SurName)"
GivenName = $User.GivenName
Surname = $User.SurName
Enabled = $true
ChangePasswordAtLogon = $false
DisplayName = $Displayname
Department = $Department
AccountPassword = (ConvertTo-SecureString $Password -AsPlainText -Force)
}
New-ADUser #userParams
}
P.S. The test for the username must come before doing more things with the $Username variable, like using it for the $Email variable. Otherwise, you could have duplicates in that too..