xref: /freebsd/usr.bin/who/who.1 (revision 953a3198a35204535cc9d450f04da982a4fea59b)
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32.\"     @(#)who.1	8.2 (Berkeley) 12/30/93
33.\"
34.Dd December 30, 1993
35.Dt WHO 1
36.Os
37.Sh NAME
38.Nm who
39.Nd display who is logged in
40.Sh SYNOPSIS
41.Nm who
42.Op Ar am I
43.Op Ar file
44.Sh DESCRIPTION
45The utility
46.Nm who
47displays
48a list of all users currently logged on, showing for each user
49the login name,
50tty name, the date and time of login, and hostname if not local.
51.Pp
52Available options:
53.Pp
54.Bl -tag -width file
55.It Ar \&am I
56Returns the invoker's real user name.
57.It Ar file
58By default,
59.Nm who
60gathers information from the file
61.Pa /var/run/utmp .
62An alternate
63.Ar file
64may be specified which is usually
65.Pa /var/run/wtmp
66(or
67.Pa /var/run/wtmp.[0-6]
68depending on site policy as
69.Pa wtmp
70can grow quite large and daily versions may or may not
71be kept around after compression by
72.Xr ac 8 ) .
73The
74.Pa wtmp
75file contains a record of every login, logout,
76crash, shutdown and date change
77since
78.Pa wtmp
79was last truncated or
80created.
81.El
82.Pp
83If
84.Pa /var/log/wtmp
85is being used as the file, the user name may be empty
86or one of the special characters '|', '}' and '~'.  Logouts produce
87an output line without any user name.  For more information on the
88special characters, see
89.Xr utmp 5 .
90.Sh FILES
91.Bl -tag -width /var/log/wtmp.[0-6] -compact
92.It Pa /var/run/utmp
93.It Pa /var/log/wtmp
94.It Pa /var/log/wtmp.[0-6]
95.El
96.Sh SEE ALSO
97.Xr last 1 ,
98.Xr users 1 ,
99.Xr getuid 2 ,
100.Xr utmp 5
101.Sh HISTORY
102A
103.Nm
104command appeared in
105.At v6 .
106