WHO(1) WHO(1) NAME who - who is on the system SYNOPSIS who [ who-file ] [ am I ] DESCRIPTION Who, without an argument, lists the login name, terminal name, and login time for each current UNIX user. Without an argument, who examines the /etc/utmp file to obtain its information. If a file is given, that file is examined. Typically the given file will be /usr/adm/wtmp, which contains a record of all the logins since it was cre- ated. Then who lists logins, logouts, and crashes since the creation of the wtmp file. Each login is listed with user name, terminal name (with `/dev/' suppressed), and date and time. When an argument is given, logouts produce a similar line without a user name. Reboots produce a line with `x' in the place of the device name, and a fossil time indica- tive of when the system went down. With two arguments, as in `who am I' (and also `who are you'), who tells who you are logged in as. FILES /etc/utmp SEE ALSO getuid(2), utmp(5)