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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 abdHlmqrstTuv
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 -bdlprTtuv .
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.
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 init 8 .
75 .It Fl q
76 .Dq Quick mode :
77 List only the names and the number of users currently logged on.
78 When this option is used, all other options are ignored.
79 .It Fl r
80 Print the current runlevel.
81 Supported runlevels are:
82 .Bl -tag -width "s (SINGLE_USER)"
83 .It Dv d Pq Dv DEATH
84 The system has halted.
85 .It Dv s Pq Dv SINGLE_USER
86 The system is running in single user mode.
87 .It Dv r Pq Dv RUNCOM
88 The system is executing
89 .Pa /etc/rc .
90 .It Dv t Pq Dv READ_TTYS
91 The system is processing
92 .Pa /etc/ttys .
93 .It Dv m Pq Dv MULTI_USER
94 The system is running in multi-user mode.
95 .It Dv T Pq Dv CLEAN_TTYS
96 The system is in the process of stopping processes
97 associated with terminal devices.
98 .It Dv c Pq Dv CATATONIA
99 The system is in the process of shutting down and will
100 not create new processes.
101 .El
102 .It Fl s
103 List only the name, line and time fields.
104 This is the default.
105 .It Fl T
106 Print a character after the user name indicating the state of the
107 terminal line:
108 .Sq +
109 if the terminal is writable;
110 .Sq -
111 if it is not;
112 and
113 .Sq \&?
114 if a bad line is encountered.
115 .It Fl t
116 Print last system clock change.
117 .It Fl u
118 Print the idle time for each user, and the associated process ID.
119 .It Fl v
120 When printing of more information is requested with
121 .Fl u ,
122 this switch can be used to also printed
123 process termination signals,
124 process exit status,
125 session id for windowing
126 and the type of the entry, see documentation of ut_type in
127 .Xr getutxent 3 .
128 .It Ar \&am I
129 Returns the invoker's real user name.
130 .It Ar file
131 By default,
132 .Nm
133 gathers information from the file
134 .Pa /var/run/utmpx .
135 An alternative
136 .Ar file
137 may be specified which is usually
138 .Pa /var/log/wtmpx
139 (or
140 .Pa /var/log/wtmp ,
141 or
142 .Pa /var/log/wtmpx.[0-6]
143 or
144 .Pa /var/log/wtmp.[0-6]
145 depending on site policy as
146 .Pa wtmpx
147 can grow quite large and daily versions may or may not
148 be kept around after compression by
149 .Xr ac 8 ) .
150 The
151 .Pa wtmpx
152 and
153 .Pa wtmp
154 file contains a record of every login, logout,
155 crash, shutdown and date change
156 since
157 .Pa wtmpx
158 and
159 .Pa wtmp
160 were last truncated or
161 created.
162 .El
163 .Pp
164 If
165 .Pa /var/log/wtmpx
166 or
167 .Pa /var/log/wtmp
168 are being used as the file, the user name may be empty
169 or one of the special characters '|', '}' and '~'.
170 Logouts produce an output line without any user name.
171 For more information on the
172 special characters, see
173 .Xr utmp 5 .
174 .Sh FILES
175 .Bl -tag -width /var/log/wtmp.[0-6] -compact
176 .It Pa /var/run/utmp
177 .It Pa /var/run/utmpx
178 .It Pa /var/log/wtmp
179 .It Pa /var/log/wtmp.[0-6]
180 .It Pa /var/log/wtmpx
181 .It Pa /var/log/wtmpx.[0-6]
182 .El
183 .Sh SEE ALSO
184 .Xr last 1 ,
185 .Xr mesg 1 ,
186 .Xr users 1 ,
187 .Xr getuid 2 ,
188 .Xr utmp 5 ,
189 .Xr utmpx 5
190 .Sh STANDARDS
191 The
192 .Nm
193 utility is expected to conform to
194 .St -p1003.2-92 .
195 .Sh HISTORY
196 A
197 .Nm
198 utility appeared in
199 .At v6 .