who(1)                                                     who(1)



     NAME
          who - who is on the system?

     SYNOPSIS
          who [-a] [-b] [-d] [-H] [-l] [-p] [-q] [-r] [-s] [-t] [-T]
          [-u] [file]

          who am i

          who am I

     DESCRIPTION
          who 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 A/UX system user.  It examines the /etc/utmp file to
          obtain its information.  If file is given, that file is ex-
          amined.  Usually, file will be /etc/wtmp, which contains a
          history of all the logins since the file was last created.

          who with am i or am I added on identifies the invoking user.

          Except for the default -s flag option, the general format
          for output entries is:

               name[ state ] line time activity pid [ comment ] [ exit
               ]

          With flag options, who can list logins, logoffs, reboots,
          and changes to the system clock, as well as other processes
          spawned by the init process.  These flag options are:

          -a  This flag option processes /etc/utmp or the named file
              with all options turned on.

          -b  This flag option indicates the time and date of the last
              reboot.

          -d  This flag option displays all processes that have ex-
              pired and not been respawned by init.

          -H  This flag option will print column headings above the
              regular output.

          -l  This flag option 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.

          -p  This flag option lists any non-getty process which is
              currently active and has been previously spawned by



     April, 1990                                                     1

     who(1)                                                     who(1)



              init.  The name field is the name of the program execut-
              ed by init as found in /etc/inittab.  The state, line,
              and activity fields have no meaning.  The comment field
              shows the id field of the line from /etc/inittab that
              spawned this process.  See inittab(4).  The exit field
              appears for dead processes and contains the termination
              and exit values (as returned by wait(2)), of the dead
              process.  This can be useful in determining why a pro-
              cess terminated.

          -q  This is a quick who, displaying only the names and the
              number of users currently logged on.  When this flag op-
              tion is used, all other flag options are ignored.

          -r  This flag option indicates the current run-level of the
              init process.

          -s  This flag option is the default and lists only the name,
              line, time, and remote host (if any) fields.

          -t  This flag option indicates the last change to the system
              clock (via the date(1) command) by root.  See su(1).

          -T  This flag option is the same as the -u flag option, ex-
              cept that the state of the terminal line is printed.
              The state describes whether someone else can write to
              that terminal.  A + appears if the terminal is writable
              by anyone; a - appears if it is not.  root can write to
              all lines having a + or a - in the state field.  If a
              bad line is encountered, a ? is printed.

          -u  This flag option lists only those users who are current-
              ly 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 activity is 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
              /etc/inittab (see inittab(4)).  This can contain infor-
              mation about where the terminal is located, the tele-
              phone number of the dataset, type of terminal if hard-
              wired, etc.






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     who(1)                                                     who(1)



     EXAMPLES
             who am i

          reports the name under which you are currently logged in.

     FILES
          /bin/who
          /etc/utmp
          /etc/wtmp
          /etc/inittab

     SEE ALSO
          date(1), login(1), mesg(1), ps(1), su(1), users(1), w(1),
          whoami(1), init(1M), wait(2), inittab(4), utmp(4).









































     April, 1990                                                     3