WHO(I) 3/15/72 WHO(I)
NAME
who - who is on the system
SYNOPSIS
who [ who-file ] [ am I ]
DESCRIPTION
Who, without an argument, lists the name, typewriter
channel, 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
created. Then who lists logins, logouts, and crashes since
the creation of the wtmp file. Each login is listed with
user name, typewriter 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, who behaves as if it had no arguments
except for restricting the printout to the line for the
current typewriter. Thus `who am I' (and also `who are
you') tells you who you are logged in as.
FILES
/etc/utmp
SEE ALSO
login (I), init (VIII)
BUGS