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 who(1)                                                               who(1)

 NAME    [Toc]    [Back]
      who - who is on the system

 SYNOPSIS    [Toc]    [Back]
      who [-muTlHqpdbrtasARW] [file]

      who am i

      who am I

 DESCRIPTION    [Toc]    [Back]
      The who command can list the user's name, terminal line, login time,
      elapsed time since input activity occurred on the line, the user's
      host name, and the process-ID of the command interpreter (shell) for
      each current system user.  It examines the utmps database to obtain
      the information.  If file is given, that file is examined, file should
      be a utmp like file.

      The who command with the am i or am I option identifies the invoking

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

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

      With options, who can list logins, logoffs, reboots, and changes to
      the system clock, as well as other processes spawned by the init

    Options    [Toc]    [Back]
           -m             Output only information about the current
                          terminal.  This option is equivalent to the am i
                          and am I options described above.

           -u             Lists only those users who are currently logged
                          in.  name is the user's login name.  line is the
                          name of the line as found in the directory /dev.
                          The time field indicates when the user logged in.

                          activity is the number of hours and minutes since
                          input 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 login process.  The
                          comment is the comment field associated with this

 Hewlett-Packard Company            - 1 -   HP-UX 11i Version 2: August 2003

 who(1)                                                               who(1)

                          line as found in /etc/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, etc.  If
                          no such information is found, then who prints, as
                          the comment, the user's host name as it was stored
                          in the utmps database or named file.  Note that
                          the user's host name is printed instead of
                          comments from the /etc/inittab file if the -u
                          option is used in conjunction with the -R option.

           -T             Same as the -u option, except that the state of
                          the terminal line is printed.  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.

                          (XPG4 only.) Only the following fields are
                          displayed: name state line time

           -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.

           -H             Prints column headings above the regular output.

           -q             A quick who, displaying only the names and the
                          number of users currently logged in.  When this
                          option is used, all other options are ignored.

           -p             Lists any other process which 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 /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

           -d             This option displays all processes that have
                          expired and have not been respawned by init.  The
                          exit field appears for dead processes and contains
                          the termination and exit values of the dead
                          process (as returned by wait() - see wait(2)).
                          This can be useful in determining why a process

 Hewlett-Packard Company            - 2 -   HP-UX 11i Version 2: August 2003

 who(1)                                                               who(1)

           -b             Indicates the time and date of the last reboot.

           -r             Indicates the current run-level of the init
                          process.  The last three fields contain the
                          current state of init, the number of times that
                          state has been previously entered, and the
                          previous state.  These fields are updated each
                          time init changes to a different run state.

           -t             Indicates the last change to the system clock (via
                          the date command) by root.  See su(1).

           -a             Processes utmps database or the named file with
                          all options turned on.

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

           -A             When the /var/adm/wtmp file is specified, (the -W
                          option can be used to examine the /var/adm/wtmps
                          file) this option indicates when the accounting
                          system was turned on or off using the startup or
                          shutacct commands (see acctsh(1M)).  The name
                          field is a dot (.).  The line field is acctg on,
                          acctg off, or a reason that was given as an option
                          to the shutacct command.  The time is the time
                          that the on/off activity occurred.

           -R             Displays the user's host name.  If the user is
                          logged in on a tty, who displays the string
                          returned from gethostname() (see gethostname(2)).
                          If the user is not logged in on a tty and the host
                          name stored in the utmps database or named utmp
                          like file has not been truncated when stored
                          (meaning that the entire host name was stored with
                          no loss of information), it is displayed as it was
                          stored.  Otherwise, the gethostbyaddr() (IPv4) or
                          getipnodebyaddr() (IPv6) function is called with
                          the internet address of the host (see
                          gethostent(3N)).  The host name returned by
                          gethostbyaddr() (IPv4) or getipnodebyaddr() (IPv6)
                          is displayed unless it returns an error, in which
                          case the truncated host name is displayed.

           -W             Gets the information from /var/adm/wtmps file.

      (XPG4 only.  The -s option can not be used with -d, -a or -T options.
      If -u option is used with -T, the idle time is added to the end of the
      -T format.)

 Hewlett-Packard Company            - 3 -   HP-UX 11i Version 2: August 2003

 who(1)                                                               who(1)

    Environment Variables
      LANG determines the locale to use for the locale categories when both
      LC_ALL and the corresponding environment variable (beginning with LC_)
      do not specify a locale.  If LANG is not set or is set to the empty
      string, a default of "C" (see lang(5)) is used.

      LC_CTYPE determines the locale for interpretation of sequences of
      bytes of text data as characters (e.g., single- verses multibyte
      characters in arguments and input files).

      LC_TIME determines the format and contents of date and time strings.

      LC_MESSAGES determines the language in which messages are displayed.

      If any internationalization variable contains an invalid setting, who
      behaves as if all internationalization variables are set to "C".  See

    International Code Set Support    [Toc]    [Back]
      Single- and multi-byte character code sets are supported.

 EXAMPLES    [Toc]    [Back]
      Check who is logged in on the system:


      Check whether or not you can write to the terminal that another user
      is using:

           who -T

      and look for a plus (+) after the user ID.

 AUTHOR    [Toc]    [Back]
      who was developed by AT&T and HP.

 FILES    [Toc]    [Back]

 SEE ALSO    [Toc]    [Back]
      date(1), login(1), mesg(1), su(1), init(1M), utmpd(1M),
      gethostname(2), wait(2), gethostent(3N), getutsent(3C), getbwent(3C),
      inittab(4), utmp(4).

      who: SVID2, SVID3, XPG2, XPG3, XPG4, POSIX.2

 Hewlett-Packard Company            - 4 -   HP-UX 11i Version 2: August 2003
[ Back ]
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