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FilledSmallSquare $UserName gives the login name of the user who invoked the Mathematica kernel, as recorded by the operating system.

FilledSmallSquare On Unix and similar operating systems, $UserName is derived from the UID associated with the Mathematica kernel process.

FilledSmallSquare On operating systems where no login name can be found, $UserName is None.

FilledSmallSquare See Section 2.14.5.

FilledSmallSquare See also: $HomeDirectory, Environment, $UserBaseDirectory.

FilledSmallSquare New in Version 3.