term% cat index.txt WHO(1) General Commands Manual WHO(1)
NAME
who, whois - who is on the system
SYNOPSIS
who [-i] [ who-file ]
who am i
whois username
DESCRIPTION
Who, without an argument, lists the login name, terminal name, and lo‐
gin time for each current UNIX user. With the -i option, the report
includes the number of minutes that the user's terminal has been idle.
With two arguments, as in `who am I' (and also `who are you'), who
tells who you are logged in as.
Without an argument, who examines the /etc/utmp file to obtain its in‐
formation. 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, 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.
Whois consults administrative files to identify the username. (Actu‐
ally, whois uses grep(1) and can locate information by any useful key,
such as real name or telephone number.)
FILES
/etc/utmp
/usr/adm/usrlist
/etc/passwd
SEE ALSO
last(1), getuid(1), getuid(2), utmp(5), wtmp(5)
WHO(1)