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User Commands who(1)
NAME
who - who is on the system
SYNOPSIS
/usr/bin/who [-abdHlmpqrstTu] [file]
/usr/bin/who -q [-n x] [file]
/usr/bin/who am i
/usr/bin/who am I
/usr/xpg4/bin/who [-abdHlmpqrtTu] [file]
/usr/xpg4/bin/who -q [-n x] [file]
/usr/xpg4/bin/who -s [-bdHlmpqrtu] [file]
/usr/xpg4/bin/who am i
/usr/xpg4/bin/who am I
DESCRIPTION
The who utility can list the user's name, terminal line,
login time, elapsed time since activity occurred on the
line, and the process-ID of the command interpreter (shell)
for each current UNIX system user. It examines the
/var/adm/utmpx file to obtain its information. If file is
given, that file (which must be in utmpx(4) format) is exam-
ined. Usually, file will be /var/adm/wtmpx, which contains a
history of all the logins since the file was last created.
The general format for output is:
name [state] line time [idle] [pid] [comment] [exit]
where:
name User's login name
state Capability of writing to the terminal
line Name of the line found in /dev
time Time since user's login
SunOS 5.10 Last change: 3 Nov 2000 1
User Commands who(1)
idle Time elapsed since the user's last activity
pid User's process id
comment Comment line in inittab(4)
exit Exit status for dead processes
OPTIONS
The following options are supported:
-a Processes /var/adm/utmpx or the named file with -b,
-d, -l, -p, -r, -t, -T, and -u options turned on.
-b Indicates the time and date of the last reboot.
-d Displays all processes that have expired and not
been respawned by init. The exit field appears for
dead processes and contains the termination and
exit values (as returned by wait(3UCB)), of the
dead process. This can be useful in determining why
a process terminated.
-H Outputs column headings above the regular output.
-l Lists only those lines on which the system is wait-
ing for someone to login. The name field is LOGIN
in such cases. Other fields are the same as for
user entries except that the state field does not
exist.
-m Outputs only information about the current termi-
nal.
SunOS 5.10 Last change: 3 Nov 2000 2
User Commands who(1)
-n x Takes a numeric argument, x, which specifies the
number of users to display per line. x must be at
least 1. The -n option can only be used with -q.
-p Lists any other process that is currently active
and has been previously spawned by init. The name
field is the name of the program executed by init
as found in /sbin/inittab. The state, line, and
idle fields have no meaning. The comment field
shows the id field of the line from /sbin/inittab
that spawned this process. See inittab(4).
-q (Quick who) Displays only the names and the number
of users currently logged on. When this option is
used, all other options are ignored.
-r Indicates the current run-level of the init pro-
cess.
-s (Default) Lists only the name, line, and time
fields.
/usr/bin/who
-T Same as the -s option, except that the state idle,
pid, and comment, fields are also written. state is
one of the following characters:
+ The terminal allows write access to other
users.
- The terminal denies write access to other
users.
? The terminal write-access state cannot be
determined.
SunOS 5.10 Last change: 3 Nov 2000 3
User Commands who(1)
/usr/xpg4/bin/who
-T Same as the -s option, except that the state field
is also written. state is one of the characters
listed under the /usr/bin/who version of this
option. If the -u option is used with -T, the idle
time is added to the end of the previous format.
-t Indicates the last change to the system clock
(using the date utility) by root. See su(1M) and
date(1).
-u Lists only those users who are currently logged in.
The name is the user's login name. The line is the
name of the line as found in the directory /dev.
The time is the time that the user logged in. The
idle column contains the number of hours and
minutes since activity last occurred on that par-
ticular line. A dot (.) indicates that the terminal
has seen activity in the last minute and is there-
fore ``current.'' If more than twenty-four hours
have elapsed or the line has not been used since
boot time, the entry is marked old. This field is
useful when trying to determine whether a person is
working at the terminal or not. The pid is the
process-ID of the user's shell. The comment is the
comment field associated with this line as found in
/sbin/inittab (see inittab(4)). This can contain
information about where the terminal is located,
the telephone number of the dataset, type of termi-
nal if hard-wired, and so forth.
OPERANDS
The following operands are supported:
am i In the "C" locale, limits the output to describing
am I the invoking user, equivalent to the -m option. The
am and i or I must be separate arguments.
file Specifies a path name of a file to substitute for
the database of logged-on users that who uses by
default.
SunOS 5.10 Last change: 3 Nov 2000 4
User Commands who(1)
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment
variables that affect the execution of who: LANG, LC_ALL,
LC_CTYPE, LC_MESSAGES, LC_TIME, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 Successful completion.
>0 An error occurred.
FILES
/sbin/inittab Script for init
/var/adm/utmpx Current user and accounting informa-
tion
/var/adm/wtmpx Historic user and accounting infor-
mation
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
/usr/bin/who
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
/usr/xpg4/bin/who
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWxcu4 |
|_____________________________|_____________________________|
| Interface Stability | Standard |
|_____________________________|_____________________________|
SunOS 5.10 Last change: 3 Nov 2000 5
User Commands who(1)
SEE ALSO
date(1), login(1), mesg(1), init(1M), su(1M), wait(3UCB),
inittab(4), utmpx(4), attributes(5), environ(5), stan-
dards(5)
NOTES
Superuser: After a shutdown to the single-user state, who
returns a prompt. Since /var/adm/utmpx is updated at login
time and there is no login in single-user state, who cannot
report accurately on this state. The command, who am i, how-
ever, returns the correct information.
SunOS 5.10 Last change: 3 Nov 2000 6
Man(1) output converted with
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This page was generated on Wed Sep 12 11:25:40 GMT 2007
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