Check existence of a login Post: 302172290

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login

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

NAME

     login -- log into the computer

SYNOPSIS

     login [-fp] [-h hostname] [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 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 themselves.

     -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 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.

FILES

     /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

SEE ALSO

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

HISTORY

     A login appeared in Version 6 AT&T UNIX.

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