How do you find the current user in a Windows environment?

Just use this command in command prompt

C:\> whoami

The answer depends on which "command-line script" language you are in.

Cmd

In the old cmd.exe command prompt or in a .bat or .cmd script, you can use the following:

%USERNAME% - Gets just the username.

%USERDOMAIN% - Gets the user's domain.

PowerShell

In the PowerShell command prompt or a .ps1 or .psm1 script, you can use the following:

[System.Security.Principal.WindowsIdentity]::GetCurrent().Name - Gives you the fully qualified username (e.g. Domain\Username). This is also the most secure method because it cannot be overridden by the user like the other $Env variables below.

$Env:Username - Gets just the username.

$Env:UserDomain - Gets the user's domain.

$Env:ComputerName - Gets the name of the computer.

Just type whoami in command prompt and you'll get the current username.

This is the main difference between username variable and whoami command:

C:\Users\user.name>echo %username%
user.name

C:\Users\user.name>whoami
domain\user.name

DOMAIN = bios name of the domain (not fqdn)

Via powershell (file.ps1) I use the following

$username = [System.Security.Principal.WindowsIdentity]::GetCurrent().Name

It returns the name of the user in the "Domain\Username" format. If you just want the username just write

$username = [System.Security.Principal.WindowsIdentity]::GetCurrent().Name.Split("\")[1]

The advantage is that It works with windows 10 windows 8 server 2016. As far as I remember with also other OS like Win7 etc. (not older) . And yeah via batch you can simply use

 $username = &whoami