Automatically Adding a Number to variable in Powershell - powershell

Question

I have looked at some sites online and browsed a few answers here and I have had no luck with my question.
I have a PowerShell script to automate account creations using information entered in the host. My question is this, how can I set my script to automatically add a number at the end of the submitted data if it already exists? Code block is below:
$Username = Read-host "Enter Desired Username"
#Test
IF(!(Get-ADUser -Identity $Username))
{ Write-Host "$username exists. Adding number.
HERE IS THE CODE I AM LOOKING FOR TO TAKE THE $Username and automatically add the number at the end.
}
If this was already answered, please send me the link and I'll mark this as answered but if not, any suggestions would be great.
Thanks!

Answer 1

Since this script isn't being automatically run and there is user input, I would suggest just re-prompting the user if the name is taken:
Do
{
$Username = Read-Host -Prompt 'Enter desired username'
} While (Get-ADUser -Identity $Username)
Alternatively:
$Username = Read-Host -Prompt 'Enter desired username'
While (Get-ADUser -Identity $Username)
{
"Username '$Username' taken!"
$Username = Read-Host -Prompt 'Enter desired username'
}

Answer 2

To supplement the other answer, you could also do something like this to determine the next available username:
$Username = Read-Host -Prompt 'Enter desired username'
$TestUsername = $Username
$i = 1
While (Get-ADUser -Identity $TestUsername)
{
Write-Warning "$TestUsername is taken"
$TestUsername = $Username + $i++
}
"The next available username is $TestUsername"
Within the loop the ++ operator is used to increment the counter variable $i and appends that to the original username each time the loop repeats. Note that it is appended first then incremented second, so we start at 1.

Answer 3

I've written such a script. My logic is:
Before creating an account, query this account firstly
If the account exists, suffix a 2 digits number (from 01, format by "{0:d2}" -f
Query the suffixed account, repeat step 1 and 2, till the account doesn't exist (use recursive function).
It's the code:
$seq = 1
Function Check-Existing {
param(
[Parameter(Mandatory=$true)]
[string]$Account
)
while (Get-ADUser $Account){
$suffix = "{0:d2}" -f $seq
$Account = $Account + $suffix
$seq++
return $Account
}
Check-Existing -Account $Account
}
(I'll double check the code on Monday)