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Unix Version 7 - man page for login (v7 section 1)

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LOGIN(1)										 LOGIN(1)

       login  -  sign on

       login [ username ]

       The login 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.	See `How to Get Started' for how to dial up initially.

       If  login  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
       will not appear on the written record of the session.

       After  a  successful  login,  accounting files are updated and the user is informed of the
       existence of .mail and message-of-the-day files.  Login initializes the user and group IDs
       and  the  working directory, then executes a command interpreter (usually sh(1)) according
       to specifications found in a password file.  Argument 0	of  the  command  interpreter  is

       Login is recognized by sh(1) and executed directly (without forking).

       /etc/utmp      accounting
       /usr/adm/wtmp  accounting
       /usr/mail/*    mail
       /etc/motd      message-of-the-day
       /etc/passwd    password file

       init(8), newgrp(1), getty(8), mail(1), passwd(1), passwd(5)

       `Login incorrect,' if the name or the password is bad.
       `No Shell', `cannot open password file', `no directory': consult a programming counselor.

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