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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.

     Login access can be controlled via	login.access(5)	or the login class in
     login.conf(5), 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.

     The login utility will submit an audit record when	login succeeds or
     fails.  Failure to	determine the current auditing state will result in an
     error exit	from login.

     /etc/fbtab			  changes device protections
     /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
     /etc/security/audit_user	  user flags for auditing
     /etc/security/audit_control  global flags for auditing

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

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

BSD			      September	13, 2006			   BSD


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