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\"     @(#)who.1        8.2 (Berkeley) 12/30/93
\"
Dd September 1, 2019
Dt WHO 1
Os
Sh NAME
Nm who
Nd display who is logged in
Sh SYNOPSIS
Nm
Op Fl abdHlmqrsTtuv
Op Ar file
Nm
Ar am i
Sh DESCRIPTION
The
Nm
utility displays a list of all users currently logged on, showing for
each user the login name, tty name, the date and time of login, and
hostname if not local.
Pp
Available options:
Bl -tag -width file
It Fl a
Same as
Fl bdlprTtuv .
It Fl b
Time of last system boot.
It Fl d
Print dead processes.
It Fl H
Write column headings above the regular output.
It Fl l
Print system login processes.
It Fl m
Only print information about the current terminal.
This is the POSIX way of saying
Nm
Ar am i .
It Fl p
Print active processes spawned by
Xr init 8 .
It Fl q
Dq Quick mode :
List only the names and the number of users currently logged on.
When this option is used, all other options are ignored.
It Fl r
Print the current runlevel.
Supported runlevels are:
Bl -tag -width "s (SINGLE_USER)"
It Dv d Pq Dv DEATH
The system has halted.
It Dv s Pq Dv SINGLE_USER
The system is running in single user mode.
It Dv r Pq Dv RUNCOM
The system is executing
Pa /etc/rc .
It Dv t Pq Dv READ_TTYS
The system is processing
Pa /etc/ttys .
It Dv m Pq Dv MULTI_USER
The system is running in multi-user mode.
It Dv T Pq Dv CLEAN_TTYS
The system is in the process of stopping processes
associated with terminal devices.
It Dv c Pq Dv CATATONIA
The system is in the process of shutting down and will
not create new processes.
El
It Fl s
List only the name, line and time fields.
This is the default.
It Fl T
Print a character after the user name indicating the state of the
terminal line:
Sq +
if the terminal is writable;
Sq -
if it is not;
and
Sq \&?
if a bad line is encountered.
It Fl t
Print last system clock change.
It Fl u
Print the idle time for each user, and the associated process ID.
It Fl v
When printing of more information is requested with
Fl u ,
this switch can be used to also printed
process termination signals,
process exit status,
session id for windowing
and the type of the entry, see documentation of ut_type in
Xr getutxent 3 .
It Ar \&am I
Returns the invoker's real user name.
It Ar file
By default,
Nm
gathers information from the file
Pa /var/run/utmpx .
An alternative
Ar file
may be specified which is usually
Pa /var/log/wtmpx
(or
Pa /var/log/wtmp ,
or
Pa /var/log/wtmpx.[0-6]
or
Pa /var/log/wtmp.[0-6]
depending on site policy as
Pa wtmpx
can grow quite large and daily versions may or may not
be kept around after compression by
Xr ac 8 ) .
The
Pa wtmpx
and
Pa wtmp
file contains a record of every login, logout,
crash, shutdown and date change
since
Pa wtmpx
and
Pa wtmp
were last truncated or
created.
El
Pp
If
Pa /var/log/wtmpx
or
Pa /var/log/wtmp
are being used as the file, the user name may be empty
or one of the special characters '|', '}' and '~'.
Logouts produce an output line without any user name.
For more information on the
special characters, see
Xr utmp 5 .
Sh FILES
Bl -tag -width /var/log/wtmp.[0-6] -compact
It Pa /var/run/utmp
It Pa /var/run/utmpx
It Pa /var/log/wtmp
It Pa /var/log/wtmp.[0-6]
It Pa /var/log/wtmpx
It Pa /var/log/wtmpx.[0-6]
El
Sh SEE ALSO
Xr last 1 ,
Xr mesg 1 ,
Xr users 1 ,
Xr getuid 2 ,
Xr utmp 5 ,
Xr utmpx 5
Sh STANDARDS
The
Nm
utility is expected to conform to
St -p1003.2-92 .
Sh HISTORY
A
Nm
utility appeared in
At v1 :
Lk https://www.bell-labs.com/usr/dmr/www/man14.pdf

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