shell_cmds/who/who.1

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  30 .\"     @(#)who.1       8.2 (Berkeley) 12/30/93
  31 .\"
  32 .Dd January 17, 2007
  33 .Dt WHO 1
  34 .Os
  35 .Sh NAME
  36 .Nm who
  37 .Nd display who is logged in
  38 .Sh SYNOPSIS
  39 .Nm
  40 .Op Fl abdHlmpqrsTtu
  41 .Op Ar file
  42 .Nm
  43 .Ar am i
  44 .Sh DESCRIPTION
  45 The
  46 .Nm
  47 utility displays a list of all users currently logged on, showing for
  48 each user the login name, tty name, the date and time of login, and
  49 hostname if not local.
  50 .Pp
  51 Available options:
  52 .Pp
  53 .Bl -tag -width file
  54 .It Fl a
  55 Same as
  56 .Fl bdlprTtu .
  57 .It Fl b
  58 Time of last system boot.
  59 .It Fl d
  60 Print dead processes.
  61 .It Fl H
  62 Write column headings above the regular output.
  63 .It Fl l
  64 Print system login processes (unsupported).
  65 .It Fl m
  66 Only print information about the current terminal.
  67 This is the
  68 .Tn POSIX
  69 way of saying
  70 .Nm
  71 .Ar am i .
  72 .It Fl p
  73 Print active processes spawned by
  74 .Xr launchd 8
  75 (unsupported).
  76 .It Fl q
  77 .Dq Quick mode :
  78 List only the names and the number of users currently logged on.
  79 When this option is used, all other options are ignored.
  80 .It Fl r
  81 Print the current runlevel.
  82 This is meaningless on Mac OS X.
  83 .It Fl s
  84 List only the name, line and time fields.
  85 This is the default.
  86 .It Fl T
  87 Print a character after the user name indicating the state of the
  88 terminal line:
  89 .Sq +
  90 if the terminal is writable;
  91 .Sq -
  92 if it is not;
  93 and
  94 .Sq \&?
  95 if a bad line is encountered.
  96 .It Fl t
  97 Print last system clock change (unsupported).
  98 .It Fl u
  99 Print the idle time for each user, and the associated process ID.
 100 .It Ar \&am I
 101 Returns the invoker's real user name.
 102 .It Ar file
 103 By default,
 104 .Nm
 105 gathers information from the file
 106 .Pa /var/run/utmpx .
 107 An alternative
 108 .Ar file
 109 may be specified.
 110 .El
 111 .Sh FILES
 112 .Bl -tag -width /var/run/utmpx -compact
 113 .It Pa /var/run/utmpx
 114 .El
 115 .Sh SEE ALSO
 116 .Xr last 1 ,
 117 .Xr mesg 1 ,
 118 .Xr users 1 ,
 119 .Xr getuid 2 ,
 120 .Xr utmpx 5
 121 .Sh STANDARDS
 122 The
 123 .Nm
 124 utility conforms to
 125 .St -p1003.1-2001 .
 126 .Sh HISTORY
 127 A
 128 .Nm
 129 utility appeared in
 130 .At v6 .