1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
169 lines
4.7 KiB
Groff
169 lines
4.7 KiB
Groff
.\" Copyright (c) 1980, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)login.1 8.1 (Berkeley) 6/9/93
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.\" $FreeBSD$
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.\"
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.Dd June 9, 1993
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.Dt LOGIN 1
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.Os BSD 4
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.Sh NAME
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.Nm login
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.Nd log into the computer
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.Sh SYNOPSIS
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.Nm login
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.Op Fl fp
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.Op Fl h Ar hostname
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.Op Ar user
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.Sh DESCRIPTION
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The
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.Nm login
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utility logs users (and pseudo-users) into the computer system.
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.Pp
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If no user is specified, or if a user is specified and authentication
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of the user fails,
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.Nm login
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prompts for a user name.
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Authentication of users is done via passwords.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl f
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The
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.Fl f
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option is used when a user name is specified to indicate that proper
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authentication has already been done and that no password need be
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requested.
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This option may only be used by the super-user or when an already
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logged in user is logging in as themselves.
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.It Fl h
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The
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.Fl h
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option specifies the host from which the connection was received.
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It is used by various daemons such as
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.Xr telnetd 8 .
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This option may only be used by the super-user.
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.It Fl p
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By default,
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.Nm login
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discards any previous environment.
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The
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.Fl p
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option disables this behavior.
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.El
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.Pp
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If the file
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.Pa /etc/nologin
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exists,
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.Nm login
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displays its contents to the user and exits.
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This is used by
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.Xr shutdown 8
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to prevent users from logging in when the system is about to go down.
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.Pp
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If the file
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.Pa /etc/login.access
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exists,
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.Nm login
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checks to see if the user and host pair are specifically allowed or denied
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access.
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.Pp
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If the file
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.Pa /etc/fbtab
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exists,
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.Nm login
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changes the protection and ownership of certain devices specified in this
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file.
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.Pp
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Immediately after logging a user in,
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.Nm login
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displays the system copyright notice, the date and time the user last
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logged in, the message of the day as well as other information.
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If the file
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.Dq Pa .hushlogin
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exists in the user's home directory, all of these messages are suppressed.
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This is to simplify logins for non-human users, such as
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.Xr uucp 1 .
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.Nm Login
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then records an entry in the
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.Xr wtmp 5
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and
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.Xr utmp 5
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files and executes the user's command interpretor.
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.Pp
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Login enters information into the environment (see
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.Xr environ 7 )
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specifying the user's home directory (HOME), command interpreter (SHELL),
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search path (PATH), terminal type (TERM) and user name (both LOGNAME and
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USER).
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.Pp
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The standard shells,
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.Xr csh 1
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and
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.Xr sh 1 ,
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do not fork before executing the
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.Nm login
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utility.
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.Sh FILES
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.Bl -tag -width /var/mail/userXXX -compact
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.It Pa /etc/fbtab
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changes device protections
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.It Pa /etc/motd
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message-of-the-day
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.It Pa /etc/nologin
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disallows logins
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.It Pa /etc/login.access
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login access control table
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.It Pa /var/run/utmp
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current logins
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.It Pa /var/log/wtmp
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login account records
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.It Pa /var/mail/user
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system mailboxes
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.It Pa \&.hushlogin
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makes login quieter
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.El
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.Sh SEE ALSO
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.Xr chpass 1 ,
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.Xr passwd 1 ,
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.Xr rlogin 1 ,
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.Xr getpass 3 ,
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.Xr fbtab 5 ,
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.Xr login.access 5 ,
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.Xr utmp 5 ,
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.Xr environ 7 ,
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.Xr nologin 8
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.Sh HISTORY
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A
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.Nm login
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appeared in
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.At v6 .
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