WHO (I)                      3/15/72                      WHO (I)

NAME            who  --  who is on the system

SYNOPSIS        who [ who-file ]

DESCRIPTION     who, without an argument, lists the name, type-

                writer channel, and login time for each current

                UNIX user.

                Without an argument, who examines the /tmp/utmp

                file to obtain its information.  If a file is

                given, that file is examined.  Typically the

                given file will be /tmp/wtmp, which contains a

                record of all the logins since it was created.

                Then who will list logins, logouts, and crashes

                since the creation of the wtmp file.

                Each login is listed with user name, last charac-

                ter of input device name (with /dev/tty sup-

                pressed), date and time.  Certain logouts produce

                a similar line without a user name.  Reboots pro-

                duce a line with "x" in the place of the device

                name, and a fossil time indicative of when the

                system went down.

FILES           /tmp/utmp

SEE ALSO        login(I), init(VII)

DIAGNOSTICS     "?" if a named file cannot be read.

BUGS            --