who(1)								   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 examined. 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

       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 waiting 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 terminal.

       -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  pro-
		gram  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 process.

       -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 charac-
	      ters:

	      +        The terminal allows write access to other users.

	      -        The terminal denies write access to other users.

	      ?        The terminal write-access state cannot be determined.

   /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 particular line. A dot (.) indicates that the terminal has seen activity in the last minute and is
	      therefore ``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  init-
	      tab(4)).	This can contain information about where the terminal is located, the telephone number of the dataset, type of terminal if
	      hard-wired, and so forth.

OPERANDS

       The following operands are supported:

       am i	In the "C" locale, limits the output to describing the invoking user, equivalent to the -m option. The am and i or I must be sepa-
       am I	rate arguments.

       file	Specifies a path name of a file to substitute for the database of logged-on users that who uses by default.

ENVIRONMENT VARIABLES

       See  environ(5)	for  descriptions of the following environment variables that affect the execution of who: LANG, LC_ALL, LC_CTYPE, LC_MES-
       SAGES, 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 information

       /var/adm/wtmpx	  Historic user and accounting information

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

   /usr/bin/who
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

   /usr/xpg4/bin/who
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWxcu4			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       date(1), login(1), mesg(1), init(1M), su(1M), wait(3UCB), inittab(4), utmpx(4), attributes(5), environ(5), standards(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, however, returns the correct information.

SunOS 5.11							    3 Nov 2000								    who(1)