I found it:

[Environment]::UserName
$Env:UserName

There is also:

$Env:UserDomain
$Env:ComputerName

Hi @Eve Harris ,

please try Get-ADUser : https://learn.microsoft.com/en-us/powershell/module/activedirectory/get-aduser?view=windowsserver2022-ps

# Get all AD Users  
Get-ADUser -Filter * -Properties Department | Select-Object GivenName, SurName, Department  
# Get user by SamAccountName  
Get-ADUser -Identity mmouse -Properties Department | Select-Object GivenName, SurName, Department  

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten

You may create a credential object this way :

$passwd = convertto-securestring -AsPlainText -Force -String <your password>

$cred = new-object -typename System.Management.Automation.PSCredential 
-argumentlist "Domain\User",$passwd

You may then pass the $cred object as the value of the -Credential parameter like this: -Credential $cred.

You may find more options that you may adapt if needed in the post
Windows PowerShell give password in command Enter-PSSession.

$dom = $env:userdomain
$usr = $env:username
([adsi]"WinNT://$dom/$usr,user").fullname

Returns:

John Doe

Some other (mostly) obscure properties also available. A few useful ones:

• Homedrive UNC
• Homedrive Letter
• Description
• Login script

Try:

[adsi]"WinNT://$dom/$usr,user" | select *

You don't need all that.

Updated to include csv export.

$users = Import-Csv -path "C:\Users\Administrator\Desktop\Bulkload\Input.csv"  
$resultsArray = @()  
foreach ($user in $users) {  
    $firstname = $user.FirstName  
    $lastname = $user.LastName  
    $i = 1                        # pointer for first name   
    $LogonNameCounter = 0  
    $LogonNameSuffix = ""     # no trailing number while looping thru first name   
    While($true) {  
        $logonname = $firstname.substring(0, $i) + $lastname + $LogonNameSuffix  
        "Looking for $logonname"  
      
        # Call AD here  
        If ($(Get-ADUser -Filter {SamAccountName -eq $logonname})) {  
          "That account exists."   
            "Try the next name."  
        } else {  
            "That account does not exist."  
            " Use this name. Add it to the results."  
            $resultsArray += [PSCustomObject]@{  
                     FirstName=$user.FirstName;  
                     LastName=$user.LastName  
                     samAccountname=$logonname  
            }  
            break                   # exit this loop.  Maybe set a flag to indicate that how to proceed.   
        }  
                  
        if ($i -eq $firstname.Length) {  
            $logonNameCounter++   
            $LogonNameSuffix = $logonNameCounter  
        } else {  
            $i++   
        }  
        if ($logonNameCounter -gt 10) {  
            "We exceeded the max number to use. Something is wrong."  
            break                   # exit the while loop   
        }  
    }  
    "Done with this user."  
}   
$resultsArray | Export-Csv "C:\Users\Administrator\Desktop\Bulkload\Output-Result.csv"