who - who is on the system


     /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


     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]


     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 line in inittab(4)

     exit  Exit status for dead processes


     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 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 process.

     -s    (Default) Lists only the name, line, and time fields.

     -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 deter-

     -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 inittab(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.


     The following operands are supported:

     am i

     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 separate arguments.

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


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


     The following exit values are returned:

     0     Successful completion.

     >0    An error occurred.


           Script for init

           Current user and accounting information

           Historic user and accounting information


     See attributes(5) for descriptions of the  following  attri-

    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | Availability                | SUNWcsu                     |

    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | Availability                | SUNWxcu4                    |
    | Interface Stability         | Standard                    |


     date(1), login(1), mesg(1),  init(1M),  su(1M),  wait(3UCB),
     inittab(4),   utmpx(4),   attributes(5),  environ(5),  stan-


     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.

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