login man page on 4.4BSD

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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 done via passwords.

     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
	     super-user or when an already logged in user is logging in as

     -h	     The -h option specifies 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
	     option disables this behavior.

     If the file /etc/nologin exists, login dislays 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.

     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).  Login then records
     an entry in the wtmp(5) and utmp(5) files and executes the user's command

     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.

     /etc/motd		message-of-the-day
     /etc/nologin	disallows logins
     /var/run/utmp	current logins
     /var/log/lastlog	last login account records
     /var/log/wtmp	login account records
     /var/mail/user	system mailboxes
     .hushlogin		makes login quieter

     chpass(1), passwd(1), rlogin(1), getpass(3), utmp(5), environ(7),

     A login appeared in Version 6 AT&T UNIX.

4th Berkeley Distribution	  May 5, 1994	     4th Berkeley Distribution

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