WHO(1) WHO(1)
NAME
who, whois, last - who is or was on the system
SYNOPSIS
who [ -i ] [ who-file ]
who am i
whois username
last [ -f who-file ] [ userid ... ] [ terminal ]
DESCRIPTION
Who, without an argument, lists the login name, terminal
name, and login time for each current 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', who tells who you are
logged in as.
Without an argument, who examines the file to obtain its
information. If a file is given, that file is examined.
Typically the given file will be 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. (Actually, whois uses grep and can locate informa-
tion by any useful key, such as real name or telephone num-
ber.)
Last reports logins and logouts in reverse chronological
order. Optional arguments restrict attention to selected
userids or terminals. Terminals tty0, tty1, ... may be
abbreviated 0, 1, ...
By default, last examines the list of logins and logouts in
option -f specifies a different file.
Last reports userid, terminal, time on, and time off for all
users, or for selected userids. A pseudo-user, `reboot', is
logged in at reboots of the system.
WHO(1) WHO(1)
Upon interrupt, last tells how far back it has looked; upon
quit (control-\) it tells how far and keeps on looking.
EXAMPLES
last reboot
Report recent system outages.
FILES
SEE ALSO
getuid(1), getuid(2), utmp(5), ac(8), tty(1), vwhois in
vismon(9.1)