who man page on DigitalUNIX

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who(1)									who(1)

       who - Identifies users currently logged in

       who [-a] | [-AbdhHlmMpqrstTu] [file]

       who am I

       who am i


       The  who	 command displays information about users and processes on the
       local system.

       Interfaces documented on this reference page conform to industry	 stan‐
       dards as follows:

       who:  XCU5.0

       Refer  to  the  standards(5)  reference page for more information about
       industry standards and associated tags.

       Specifies all options; processes /var/adm/utmp or the named  file  with
       all options on. Equivalent to using the -b, -d, -l, -p, -r, -t, -T, and
       -u options.  [Tru64 UNIX]  Displays accounting entries from the	speci‐
       fied  file. Accounting information is stored in the /var/adm/wtmp file,
       so you should specify that file. If you omit the file argument, the who
       command	attempts  to  display information from the /var/adm/utmp file,
       which normally contains no accounting information.  If  accounting  has
       never  been  enabled on your system, this option causes the who command
       to produce no output.  Indicates the most recent system	start-up  time
       and  date.   Displays  all  processes  that  have expired without being
       regenerated by init.  The exit_status field appears for dead  processes
       and  contains  the termination and exit values (as returned by wait) of
       the dead processes.  (This option  is  useful  for  determining	why  a
       process	ended.)	  [Tru64  UNIX]	 Displays  a help message.  Displays a
       header (title).	Lists only terminals not in use.  The  user  field  is
       LOGIN  in  such	cases.	Other  fields are the same as for user entries
       except that the state field  does  not  appear.	 Displays  information
       about  the  current  terminal  (same  as who am i or who am I).	[Tru64
       UNIX]  Lists only the user, line, time and host (if not	null)  fields.
       Lists  any  active  process that is currently active and was previously
       generated by init.  Prints a quick listing of users and the  number  of
       users  on the local system. When you use this option, all other options
       are ignored.  Indicates the current run-level of the  system  and  pro‐
       vides information about the system's state. An example might be:

	      .	  run-level 3 Jan 02 07:34   3	 0   S

	      . is a placeholder for the user name field.

	      Jan 02 07:34 is when the current run-level was last entered.

	      The 3 is the current state or run level (termination status).

	      The  0 is the number of times the current state has been entered
	      previously (id).

	      The S is an identification of the previous state	or  run	 level
	      (exit  status).	Lists only the user, line and the time fields.
	      (This is the default; thus, who  and  who	 -s  are  equivalent).
	      Indicates	 the  last change to the system clock by the superuser
	      using the date command.  Displays the  status  of	 the  terminal
	      line  and	 indicates  who can write to that terminal as follows:
	      Writable by anyone.  Writable only by the superuser or the  ter‐
	      minal's  owner.	[Tru64	UNIX]  Bad line encountered.  Displays
	      the username, terminal name, login time, line activity  and  the
	      process-ID of each current user.

       Name  of	 the  file to be used, instead of /var/adm/utmp, to obtain the

       The who command displays the following information for the users and/or
       processes you specify: Login name Terminal name Date Time of login Host

       Entering	 who am i or who am I displays your login name, terminal name,
       date and time you logged in and the host. This is equivalent to the  -m

       [Tru64 UNIX]  Entering whoami displays your login name only.

       With options, who also can display the elapsed time since line activity
       occurred, the process-ID of the command	interpreter  (shell),  logins,
       logouts,	 restarts  and	changes	 to the system clock, as well as other
       processes generated by the init process.

       The general output format of  the  who  command	is  as	follows:  user
       [state] line time activity process_ID [exit_status]

       user is the user's login name.  state indicates whether or not the line
       is readable by everyone (see the -T option).  line is the name  of  the
       line as found in the /dev directory.  time is the time that user logged
       in.  activity is the hours and minutes since activity last occurred  on
       that  user's line. A (dot) here indicates line activity within the last
       minute. If the line has been quiet more than 24 hours or has  not  been
       used  since  the	 last  system  start-up,  the  entry is marked as old.
       process_ID is the process-ID of the user's shell.  exit_status  is  the
       exit status of ended processes (see the -d option).

       [Tru64	UNIX]  To   obtain  its	 information,  who  normally  examines
       /var/adm/utmp.  If you specify another file,  who  examines  the	 named
       file  instead.  This file will usually be /var/adm/wtmp, which contains
       the history of all logins since the file was last created.

       Note that who only identifies users on the local node.

       To display information about who is using the local system, enter: who

	      Information similar to the following is displayed: george	  con‐
	      sole Jun 8  08:34 To display your username, enter: whoami

	      Information similar to the following is displayed: huang To dis‐
	      play a history of logins, logouts, system start-ups  and	system
	      shutdowns, enter: who /var/adm/wtmp

	      Information  similar  to the following is displayed: huang  con‐
	      sole Jun 8  08:34 john   console Jun 8  08:34 rachel console Jun
	      8	 08:22 spike  ttyp4   Jun 8  09:19 To display the run-level of
	      the local system, enter: who -r

	      Information similar to the following is displayed:  run-level  3
	      Jan  05  08:36	  3	 0     S To display any active process
	      that is currently active and was previously generated  by	 init,
	      enter: who -p

	      Information similar to the following is displayed: .    tty4 Jun
	      8	    04:15   .	 tty7 Jun    8	   04:15    .	 tty14	   Jun
	      8	    04:15

       The  following  exit  values  are  returned: Successful completion.  An
       error occurred.

       The following environment variables affect the execution of  who:  Pro‐
       vides  a	 default value for the internationalization variables that are
       unset or null. If LANG is unset or null, the corresponding  value  from
       the  default  locale  is used. If any of the internationalization vari‐
       ables contain an invalid setting, the utility behaves as if none of the
       variables  had been defined.  If set to a non-empty string value, over‐
       rides the values	 of  all  the  other  internationalization  variables.
       Determines  the	locale for the interpretation of sequences of bytes of
       text data as characters (for example, single-byte as opposed to	multi‐
       byte  characters	 in  arguments).  Determines the locale for the format
       and contents of diagnostic messages written to standard error.	Deter‐
       mines  the  locale  used	 for  the format and contents of date and time
       strings in the output.  Determines the location of  message  catalogues
       for the processing of LC_MESSAGES.

       Contains user and accounting information.  Contains login history.

       Commands:  date(1),   init(8),	login(1),   mesg(1),  su(1),  rwho(1),
       users(1), wait(1), whoami(1)

       Functions:  wait(2)

       Files:  utmp(4)

       Standards:  standards(5)


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