| LOGNAME(1) | General Commands Manual | LOGNAME(1) | 
logname —
| logname | 
logname utility writes the user's login name to
  standard output followed by a newline.
The logname utility explicitly ignores the
    LOGNAME and USER environment
    variables because the environment cannot be trusted.
logname utility exits 0 on success,
  and >0 if an error occurs.
logname utility conforms to IEEE
  Std 1003.2-1992 (“POSIX.2”).
logname command appeared in
  4.4BSD.
| June 9, 1993 | NetBSD 10.1 |