LOGIN(I)                     3/15/72                     LOGIN(I)


     login  -  sign onto UNIX


     login [ username ]


     The login command is used when a user initially  signs  onto

     UNIX,  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


     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  (I))  according  to  specifications

     found in a password file.

     Login is recognized  by  the  Shell  and  executed  directly

     (without forking).


     /etc/utmp       accounting

     /usr/adm/wtmp   accounting

     .mail           mail

     /etc/motd       message-of-the-day

     /etc/passwd     password file


     init (VIII), getty (VIII), mail (I), passwd (I), passwd (V)


     `login incorrect,' if the name or the password is bad.   `No

     Shell,',   `cannot  open  password  file,'  `no  directory':

     consult a UNIX programming counselor.