LOGNAME(1) BSD Reference Manual LOGNAME(1)
logname - display user's login name
The logname utility writes the user's login name to standard output fol-
lowed by a newline.
The logname utility explicitly ignores the LOGNAME and USER environment
variables because the environment cannot be trusted.
The logname utility exits 0 on success, and >0 if an error occurs.
who(1), whoami(1), getlogin(3)
The logname function is expected to conform to IEEE Std1003.2
The logname command appears in 4.4BSD.
4.4BSD June 9, 1993 1