|| FreeBSD General Commands Manual
display user's login name
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.
EXIT STATUS The
logname utility exits 0 on success, and >0 if an error occurs.
logname utility is expected to conform to IEEE Std 1003.2 (“POSIX.2”).
logname command appeared in