Best way to check for system user and password in C Post: 302383998

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LEARN ABOUT V7

login

LOGIN(1)						      General Commands Manual							  LOGIN(1)

NAME

       login  -  sign on

SYNOPSIS

       login [ username ]

DESCRIPTION

       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 speci-
       fications found in a password file.  Argument 0 of the command interpreter is `-sh.

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

FILES

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

SEE ALSO

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

DIAGNOSTICS

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

																	  LOGIN(1)