login man page on Ultrix

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login(1)							      login(1)

Name
       login - log in to a system

Syntax
       login [username]

Description
       The  command  is used when a user initially signs on, or it may be used
       at any time to change from one user to another.	The latter case is the
       one summarized above and described here.	 To sign on initially, see the
       Guide to System Environment Setup.

       If is invoked without an argument, it asks for a	 user  name,  and,  if
       appropriate,  a	password.   Echoing is turned off (if possible) during
       the typing of the password, so it does not appear on the written record
       of the session.

       After  a	 successful  login  accounting	files are updated, the user is
       informed of the existence of mail, the message of the day  is  printed,
       and the time of last successful login is displayed.  The display of all
       this information can be prevented by creating the  file	.hushlogin  in
       the accounts login directory. This is useful for accounts such as uucp.

       If  ULTRIX  security features are enabled additional things may happen.
       These include the display of the number of failed login attempts	 since
       the  last  successful  login and forcing the setting of a new password.
       See the Security Guide for Users and Security Guide for	Administrators
       for more information.

       The  command initializes the user and group IDs, the working directory,
       and the users audit information, then executes a	 command  interpreter,
       usually according to specifications found in a password file.  Argument
       0 of the command interpreter is “-sh”, or more generally	 the  name  of
       the command interpreter with a leading dash (“-”) prepended.

       The  command also initializes the environment with information specify‐
       ing home directory, command interpreter, terminal type  (if  available)
       and user name.

       When  is used in conjunction with it is the responsibility of the getty
       program to initialize the terminal attributes.  Specifically if a  ter‐
       minal  is  setup to use 8-bit characters the program should use a entry
       which specifies 8-bit characters.  If a terminal is setup in 8-bit mode
       but fails to specify an 8-bit gettytab entry, then characters output by
       both and may appear as multinational characters.

       If the file exists, prints its contents	on  the	 user's	 terminal  and
       exits.  This  is	 used  by  to stop users logging in when the system is
       about to go down.

       The command is recognized by and and executed directly  (without	 fork‐
       ing).

       If  a  root  login  is  attempted and an invalid command interpreter is
       specified, the interpreter is used.

Options
       -r		   Used by the remote login server, to force to	 enter
			   into an initial connection protocol.

       -P <programname>	   Causes  to set it's standard input and output to be
			   connected to the prompting program <programname>.

       -C string	   Allows the system to specify a command  to  be  run
			   using  the user's shell.  This option causes a user
			   shell -c string to be

       -e		   Forces to use an extended protocol when communicat‐
			   ing with a prompter program (see -P).

Restrictions
       To  provide  flow control, CTRL/S and CTRL/Q are ignored and are there‐
       fore invalid characters in a login name.

Diagnostics
       Login incorrect
       If the username and password are not a valid combination.

       Too many users logged on already. Try again later.
       The system has the maximum licensed number of users logged on already.

       License not valid for this version of ULTRIX.
       The PAK that has been registered is for an earlier version of ULTRIX.

       No valid license found for ULTRIX.
       There is either no ULTRIX PAK registered or the PAK that has been found
       is not valid, possibly because it has terminated.

       Requires secure terminal
       An  attempt  was made to login as UID 0 on a line that is not marked as
       secure in

       No shell
       The login shell specified for the account cannot be  executed.  Consult
       the system administrator.

       No directory! Logging in with home=/
       The  HOME directory for the account is inaccessible. This can happen if
       the directory resides on an NFS file system served by a	host  that  is
       not currently available.

       You have too many processes running
       Completion  of  login  would  exceed the maximum number of running pro‐
       cesses allowed for the user.

       You have mail
       You have a non-empty mail spool file.

       If ULTRIX security features are enabled the following messages are also
       possible from login:

       Your password has expired
       The  password  for  your	 account has not been changed recently enough.
       Consult your system administrator.

       Your password has expired, please change it
       Your password has expired recently. You have to change  it  before  you
       can proceed any further.

       Your password will expire very soon
       Your password will expire in less than 24 hours.

       Your password will expire in %d days
       The  ``%d''  is	replaced  with	the number of days until your password
       expires. You should consider changing your password now.

       This account is disabled
       Consult your system administrator.

       Kerberos initialization failure
       Consult your system administrator.

Files
       accounting
       accounting
       mail
       message-of-the-day
       authorization data base
       password file
       stops logins
       sets I&A security level
       makes login quieter
       lists ttys that root may log in on
See Also
       mail(1), passwd(1), yppasswd(1yp), passwd(5yp),	environ(7),  getty(8),
       init(8), rlogind(8c), shutdown(8)
       Guide to System Environment Setup
       Security Guide for Users
       Security Guide for Administrators

								      login(1)
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