Annotation of src/usr.bin/login/login.1, Revision 1.7
1.7 ! aaron 1: .\" $OpenBSD: login.1,v 1.6 1997/09/14 01:02:21 deraadt Exp $
1.1 deraadt 2: .\" $NetBSD: login.1,v 1.7 1995/08/31 22:52:33 jtc Exp $
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35: .\" @(#)login.1 8.2 (Berkeley) 5/5/94
36: .\"
37: .Dd May 5, 1994
38: .Dt LOGIN 1
39: .Os BSD 4
40: .Sh NAME
41: .Nm login
42: .Nd log into the computer
43: .Sh SYNOPSIS
44: .Nm login
45: .Op Fl fp
46: .Op Fl h Ar hostname
47: .Op Ar user
48: .Sh DESCRIPTION
49: The
50: .Nm login
51: utility logs users (and pseudo-users) into the computer system.
52: .Pp
53: If no user is specified, or if a user is specified and authentication
54: of the user fails,
55: .Nm login
56: prompts for a user name.
57: Authentication of users is done via passwords.
58: Alternately, the user can enter the password "s/key", in which case
59: S/Key authentication of users is performed, as descibed in
60: .Xr skey 1 .
61: S/Key is a Trademark of Bellcore.
62: .Pp
63: The options are as follows:
64: .Bl -tag -width Ds
65: .It Fl f
66: The
67: .Fl f
68: option is used when a user name is specified to indicate that proper
69: authentication has already been done and that no password need be
70: requested.
71: This option may only be used by the super-user or when an already
72: logged in user is logging in as themselves.
73: .It Fl h
74: The
75: .Fl h
76: option specifies the host from which the connection was received.
77: It is used by various daemons such as
78: .Xr telnetd 8 .
79: This option may only be used by the super-user.
80: .It Fl p
81: By default,
82: .Nm login
83: discards any previous environment.
84: The
85: .Fl p
86: option disables this behavior.
87: .El
88: .Pp
89: If the file
90: .Pa /etc/nologin
91: exists,
92: .Nm login
93: displays its contents to the user and exits.
94: This is used by
95: .Xr shutdown 8
96: to prevent users from logging in when the system is about to go down.
97: .Pp
1.3 deraadt 98: If the file
99: .Pa /etc/fbtab
100: exists,
101: .Nm login
102: changes the protection and ownership of certain devices specified in this
103: file.
104: .Pp
1.5 millert 105: If the file
106: .Pa /var/log/failedlogin
107: exists,
108: .Nm login
109: will record failed login attempts in this file.
110: .Pp
1.1 deraadt 111: Immediately after logging a user in,
112: .Nm login
113: displays the system copyright notice, the date and time the user last
1.5 millert 114: logged in, the date and time of the last unsucessful login (if the file
115: .Pa /var/log/failedlogin
116: exists), the message of the day as well as other information.
1.1 deraadt 117: If the file
118: .Dq Pa .hushlogin
119: exists in the user's home directory, all of these messages are suppressed.
120: This is to simplify logins for non-human users, such as
121: .Xr uucp 1 .
1.7 ! aaron 122: .Nm login
1.1 deraadt 123: then records an entry in the
124: .Xr wtmp 5
125: and
126: .Xr utmp 5
127: files and executes the user's command interpreter.
128: .Pp
1.7 ! aaron 129: .Nm login
! 130: enters information into the environment (see
1.1 deraadt 131: .Xr environ 7 )
1.7 ! aaron 132: specifying the user's home directory
! 133: .Pq Ev HOME ,
! 134: command interpreter
! 135: .Pq Ev SHELL ,
! 136: search path
! 137: .Pq Ev PATH ,
! 138: terminal type
! 139: .Pq Ev TERM ,
! 140: and user name
! 141: .Po both Ev LOGNAME and Ev USER
! 142: .Pc .
1.1 deraadt 143: .Pp
144: The standard shells,
145: .Xr csh 1
146: and
147: .Xr sh 1 ,
148: do not fork before executing the
149: .Nm login
150: utility.
151: .Sh FILES
1.7 ! aaron 152: .Bl -tag -width /var/log/failedlogin -compact
1.3 deraadt 153: .It Pa /etc/fbtab
154: changes device protections
1.1 deraadt 155: .It Pa /etc/motd
156: message-of-the-day
157: .It Pa /etc/nologin
158: disallows logins
159: .It Pa /var/run/utmp
160: current logins
161: .It Pa /var/log/lastlog
162: last login account records
163: .It Pa /var/log/wtmp
164: login account records
1.5 millert 165: .It Pa /var/log/failedlogin
166: failed login account records
1.1 deraadt 167: .It Pa /var/mail/user
168: system mailboxes
169: .It Pa \&.hushlogin
170: makes login quieter
171: .El
172: .Sh SEE ALSO
173: .Xr chpass 1 ,
174: .Xr passwd 1 ,
175: .Xr rlogin 1 ,
176: .Xr skey 1 ,
177: .Xr getpass 3 ,
1.7 ! aaron 178: .Xr fbtab 5 ,
1.1 deraadt 179: .Xr utmp 5 ,
1.7 ! aaron 180: .Xr environ 7
1.1 deraadt 181: .Sh HISTORY
182: A
183: .Nm login
1.7 ! aaron 184: utility appeared in
1.1 deraadt 185: .At v6 .
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