LOGIN(1)                System General Commands Manual                LOGIN(1)

NAME
     login - log into the computer

SYNOPSIS
     login [-fIpPq] [-d domain] [-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.  Alternately, the user can enter the password
     "s/key", in which case S/Key authentication of users is performed, as
     descibed in skey(1).  S/Key is a Trademark of Bellcore.

     The default domain that a user will be logged into if a filly qualified
     username (FQUN) is not given is presented in brackets before the username
     prompt. The default domain will be pre-pended to a username if the user-
     name is not a FQUN. The default domain is tken from registry entry
     HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Services For Unix/PrincipalDomain
     with Interix 3.5 and from the registry entry
     HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/SUA/PrincipalDomain for all ver-
     sions thereafter. If the registry entry is not set then the result from
     the getpdomain(3) call is used.

     The options are as follows:

     -d domain
             Use this domain as the default domain for fully qualified user-
             names (FQUN).

     -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 hostname
             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.

     -I      Prior to the initial prompt for a username display information
             about fully qualified usernames (FQUN, DOMAIN+username).

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

     -q      Works as though the file .huslogin has been found in the user's
             home directory.

     If the file /etc/nologin exists, 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 /var/log/adm/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/adm/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(1).  login success then indirectly causes the subsystem to
     record an entry in the wtmpx(5) and utmpx(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.

     This version of login has been enhanced to work with s/key. Assuming you
     have properly initialized s/key you will enter "s/key" when asked the
     password. This will activate the s/key response. If you enter the correct
     one time response then you will be allowed to login provided that you
     have registered your password previously with the regpwd utility. Please
     note that the most common mistake is not providing the one time response
     that matches the sequence number in the prompt.

FILES
     /etc/motd             message-of-the-day
     /etc/nologin          disallows logins
     /var/adm/log/lastlog  last login account records
     /var/adm/wtmpx        login account records
     /var/log/adm/failedlogin
                           failed login account records (needs to be created
                           by the administrator)
     /var/mail/user        system mailboxes
     .hushlogin            makes login quieter

SEE ALSO
     chpass(2), getdomain(2), getpass(3), passwd(1), regpwd(1), rlogin(1),
     skey(1), skeyinit(1), ssh(1), utmpx(5),

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

Interix                          June 28, 2008                         Interix