who/who.1

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  34 .\"     @(#)who.1       8.2 (Berkeley) 12/30/93
  35 .\"
  36 .Dd December 6, 1994
  37 .Dt WHO 1
  38 .Os
  39 .Sh NAME
  40 .Nm who
  41 .Nd display who is logged in
  42 .Sh SYNOPSIS
  43 .Nm
  44 .Op Fl mTuH
  45 .Op Ar file
  46 .Nm ""
  47 .Ar am i
  48 .Sh DESCRIPTION
  49 The
  50 .Nm
  51 utility displays a list of all users currently logged on, showing for
  52 each user the login name, tty name, the date and time of login, and
  53 hostname if not local.
  54 .Pp
  55 Available options:
  56 .Pp
  57 .Bl -tag -width file
  58 .It Fl m
  59 Only print information about the current terminal.  This is the
  60 .Tn POSIX
  61 way of saying
  62 .Nm
  63 .Ar am i .
  64 .It Fl T
  65 Print a character after the user name indicating the state of the
  66 terminal line:
  67 .Sq +
  68 if the terminal is writable;
  69 .Sq -
  70 if it is not;
  71 and
  72 .Sq ?
  73 if a bad line is encountered.
  74 .It Fl u
  75 Print the idle time for each user.
  76 .It Fl H
  77 Write column headings above the regular output.
  78 .It Ar \&am I
  79 Returns the invoker's real user name.
  80 .It Ar file
  81 By default,
  82 .Nm
  83 gathers information from the file
  84 .Pa /var/run/utmp .
  85 An alternative
  86 .Ar file
  87 may be specified which is usually
  88 .Pa /var/log/wtmp
  89 (or
  90 .Pa /var/log/wtmp.[0-6]
  91 depending on site policy as
  92 .Pa wtmp
  93 can grow quite large and daily versions may or may not
  94 be kept around after compression by
  95 .Xr ac 8 ) .
  96 The
  97 .Pa wtmp
  98 file contains a record of every login, logout,
  99 crash, shutdown and date change
 100 since
 101 .Pa wtmp
 102 was last truncated or
 103 created.
 104 .El
 105 .Pp
 106 If
 107 .Pa /var/log/wtmp
 108 is being used as the file, the user name may be empty
 109 or one of the special characters '|', '}' and '~'.  Logouts produce
 110 an output line without any user name.  For more information on the
 111 special characters, see
 112 .Xr utmp 5 .
 113 .Sh FILES
 114 .Bl -tag -width /var/log/wtmp.[0-6] -compact
 115 .It Pa /var/run/utmp
 116 .It Pa /var/log/wtmp
 117 .It Pa /var/log/wtmp.[0-6]
 118 .El
 119 .Sh SEE ALSO
 120 .Xr last 1 ,
 121 .Xr mesg 1 ,
 122 .Xr users 1 ,
 123 .Xr getuid 2 ,
 124 .Xr utmp 5
 125 .Sh STANDARDS
 126 The
 127 .Nm
 128 utility is expected to conform to
 129 .St -p1003.2-92 .
 130 .Sh HISTORY
 131 A
 132 .Nm
 133 utility appeared in
 134 .At v6 .