xref: /netbsd-src/usr.bin/who/who.1 (revision b8c616269f5ebf18ab2e35cb8099d683130a177c)
1.\"	$NetBSD: who.1,v 1.11 2002/09/30 11:09:17 grant Exp $
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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
49The
50.Nm
51utility displays a list of all users currently logged on, showing for
52each user the login name, tty name, the date and time of login, and
53hostname if not local.
54.Pp
55Available options:
56.Pp
57.Bl -tag -width file
58.It Fl m
59Only print information about the current terminal.
60This is the
61.Tn POSIX
62way of saying
63.Nm
64.Ar am i .
65.It Fl T
66Print a character after the user name indicating the state of the
67terminal line:
68.Sq +
69if the terminal is writable;
70.Sq -
71if it is not;
72and
73.Sq ?
74if a bad line is encountered.
75.It Fl u
76Print the idle time for each user.
77.It Fl H
78Write column headings above the regular output.
79.It Ar \&am I
80Returns the invoker's real user name.
81.It Ar file
82By default,
83.Nm
84gathers information from the file
85.Pa /var/run/utmp .
86An alternative
87.Ar file
88may be specified which is usually
89.Pa /var/log/wtmp
90(or
91.Pa /var/log/wtmp.[0-6]
92depending on site policy as
93.Pa wtmp
94can grow quite large and daily versions may or may not
95be kept around after compression by
96.Xr ac 8 ) .
97The
98.Pa wtmp
99file contains a record of every login, logout,
100crash, shutdown and date change
101since
102.Pa wtmp
103was last truncated or
104created.
105.El
106.Pp
107If
108.Pa /var/log/wtmp
109is being used as the file, the user name may be empty
110or one of the special characters '|', '}' and '~'.
111Logouts produce an output line without any user name.
112For more information on the
113special characters, see
114.Xr utmp 5 .
115.Sh FILES
116.Bl -tag -width /var/log/wtmp.[0-6] -compact
117.It Pa /var/run/utmp
118.It Pa /var/log/wtmp
119.It Pa /var/log/wtmp.[0-6]
120.El
121.Sh SEE ALSO
122.Xr last 1 ,
123.Xr mesg 1 ,
124.Xr users 1 ,
125.Xr getuid 2 ,
126.Xr utmp 5
127.Sh STANDARDS
128The
129.Nm
130utility is expected to conform to
131.St -p1003.2-92 .
132.Sh HISTORY
133A
134.Nm
135utility appeared in
136.At v6 .
137