login man page on OpenBSD

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LOGIN(1)		   OpenBSD Reference Manual		      LOGIN(1)

     login - log into the computer

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

     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.,

     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

     -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
	     information is passed on to any classify script (see

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

     -R remote-addr
	     The -R option specifies the remote address of a socket.  This
	     information is passed on to any classify script (see

     -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, such as
     uucp.  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.

     login sets the following environment variables:

     HOME	 The user's home directory, as specified by the password

     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.

     /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

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

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

OpenBSD 4.9		       December 10, 2010		   OpenBSD 4.9

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