NAME

who − who is on the system

SYNOPSIS

who [ who-file ] [ am I ]

DESCRIPTION

Without an argument, who lists the login name, terminal name, and login time for each current UNIX user.  It examines the /etc/utmp file to obtain its information. 

If a filename is specified on the command line, who searches that file for this login information.  Typically the given file will be /usr/adm/wtmp, which contains a record of all the logins since it was created.  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 indicative of when the system went down. 

With two arguments, as in ‘who am I’ (and also ‘who are you’), who tells what user you are logged in as, what terminal you are using, and when you logged in. 

FILES

/etc/utmp

SEE ALSO

getuid(2), utmp(5)

INTEGRATED SOLUTIONS 4.3 BSD  —  April 29, 1985