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

NAME
     login -- log into the computer

SYNOPSIS
     login [-fp] [-h hostname] [-L local-addr] [-R remote-addr]	[-u username]
	   [user]

DESCRIPTION
     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	normally done via passwords, though external authentication mechanisms
     may be used (see login.conf(5)).  To specify the alternate	authentication
     mechanism style, the string :style	is appended to the user	name (i.e.,
     user:style).

     The options are as	follows:

     -f	     The -f option is used when	a user name is specified to indicate
	     that proper authentication	has already been done and that no
	     password need be requested.  This option may only be used by the
	     superuser.

     -h	hostname
	     Specifies the host	from which the connection was received.	 This
	     option may	only be	used by	the superuser.

     -L	local-addr
	     The -L option specifies the local address of a socket.  This in-
	     formation is passed on to any classify script (see
	     login.conf(5)).

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

     -R	remote-addr
	     The -R option specifies the remote	address	of a socket.  This in-
	     formation is passed on to any classify script (see
	     login.conf(5)).

     -u	username
	     Specifies the remote user that initiated the connection.  This
	     option may	only be	used by	the superuser.

     If	the file /etc/nologin exists (and the "ignorenologin" boolean is not
     set in the	user's login class), login displays its	contents to the	user
     and exits.	 This is used by shutdown(8) to	prevent	users from logging in
     when the system is	about to go down.

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

     If	the file /var/log/failedlogin exists, login will record	failed login
     attempts 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 date and time of
     the last unsuccessful login (if the file /var/log/failedlogin exists),
     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.  login
     then records an entry in the wtmp(5) and utmp(5) files and	executes the
     user's command interpreter.

     login enters information into the environment (see	environ(7)) specifying
     the user's	home directory (HOME), command interpreter (SHELL), search
     path (PATH), terminal type	(TERM),	and user name (both LOGNAME and	USER).

     The standard shells, csh(1) and sh(1), do not fork	before executing the
     login utility.

     Note that if login	is invoked by a	non-root user, it will execute su(1)
     in	login emulation	mode instead.

ENVIRONMENT
     login sets	the following environment variables:

     HOME	 The user's home directory, as specified by the	password data-
		 base.

     SHELL	 The user's shell, as specified	by the password	database.

     TERM	 The user's terminal type, if it can be	determined.

     LOGNAME	 The user's login name.

     USER	 Same as LOGNAME.

     MAIL	 The user's mailbox.

     REMOTEHOST	 The name of the host from which the user logged in, if	the -h
		 flag was specified.

     REMOTEUSER	 The name of the remote	user who initiated the connection, if
		 the -u	flag was specified.

     Other environment variables may be	specified in /etc/login.conf via the
     "setenv" capability.

FILES
     /etc/fbtab		   changes device protections
     /etc/login.conf	   login configuration
     /etc/motd		   message-of-the-day
     /etc/nologin	   disallows logins
     /var/log/failedlogin  failed login	account	records
     /var/log/lastlog	   last	login account records
     /var/log/wtmp	   login account records
     /var/mail/user	   system mailboxes
     /var/run/utmp	   current logins
     .hushlogin		   makes login quieter

SEE ALSO
     chpass(1),	passwd(1), su(1), telnet(1), readpassphrase(3),
     setusercontext(3),	fbtab(5), login.conf(5), utmp(5), environ(7)

HISTORY
     A login utility appeared in Version 3 AT&T	UNIX.

BSD			       September 4, 2016			   BSD

NAME | SYNOPSIS | DESCRIPTION | ENVIRONMENT | FILES | SEE ALSO | HISTORY

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