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LOGIN(1)		  BSD General Commands Manual		      LOGIN(1)

     login -- log into the computer

     login [-fp] [-h hostname] [user]

     The login utility logs users (and pseudo-users) into the computer system.

     If	no user	is specified, or if a user is specified	and authentication of
     the user fails, login prompts for a user name.  Authentication of users
     is	configurable via pam(8).  Password authentication is the default.

     The following options are available:

     -f	     When a user name is specified, this option	indicates that proper
	     authentication has	already	been done and that no password need be
	     requested.	 This option may only be used by the super-user	or
	     when an already logged in user is logging in as themselves.

     -h	     Specify the host from which the connection	was received.  It is
	     used by various daemons such as telnetd(8).  This option may only
	     be	used by	the super-user.

     -p	     By	default, login discards	any previous environment.  The -p op-
	     tion disables this	behavior.

     If	the file /etc/login.access exists, login checks	to see if the user and
     host pair are specifically	allowed	or denied access.  Login access	may
     also be controlled	via the	login class, which provides allow and deny
     records based on time, tty	and remote host	name.

     If	the file /etc/fbtab exists, login changes the protection and ownership
     of	certain	devices	specified in this file.

     Immediately after logging a user in, login	displays the system copyright
     notice, the date and time the user	last logged in,	the message of the day
     as	well as	other information.  If the file	.hushlogin exists in the
     user's home directory, all	of these messages are suppressed.  This	is to
     simplify logins for non-human users, such as uucp(1).

     The login utility enters information into the environment (see
     environ(7)) specifying the	user's home directory (HOME), command inter-
     preter (SHELL), search path (PATH), terminal type (TERM) and user name
     (both LOGNAME and USER).  Other environment variables may be set due to
     entries in	the login class	capabilities database, for the login class as-
     signed in the user's system passwd	record.	 The login class also controls
     the maximum and current process resource limits granted to	a login,
     process priorities	and many other aspects of a user's login environment.

     Some shells may provide a builtin login command which is similar or iden-
     tical to this utility.  Consult the builtin(1) manual page.

     /etc/fbtab		changes	device protections
     /etc/login.access	login access control table
     /etc/login.conf	login class capabilities database
     /etc/motd		message-of-the-day
     /var/mail/user	system mailboxes
     .hushlogin		makes login quieter
     /etc/auth.conf	configure authentication services
     /etc/pam.d/login	pam(8) configuration file

     builtin(1), chpass(1), csh(1), passwd(1), rlogin(1), getpass(3),
     fbtab(5), login.access(5),	login.conf(5), environ(7), pam(8)

     A login utility appeared in Version 6 AT&T	UNIX.

BSD			       October 16, 2004				   BSD


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