INIT(8) 						      System Manager's Manual							   INIT(8)

NAME

       init, rc  -  process control initialization

SYNOPSIS

       /etc/init
       /etc/rc

DESCRIPTION

       Init  is  invoked  as  the last step of the boot procedure (see boot(8)).  Generally its role is to create a process for each typewriter on
       which a user may log in.

       When init first is executed the console typewriter /dev/console.  is opened for reading and writing and the shell is  invoked  immediately.
       This  feature  is used to bring up a single-user system.  If the shell terminates, init comes up multi-user and the process described below
       is started.

       When init comes up multiuser, it invokes a shell, with input taken from the file /etc/rc.  This command	file  performs	housekeeping  like
       removing temporary files, mounting file systems, and starting daemons.

       Then  init  reads  the file /etc/ttys and forks several times to create a process for each typewriter specified in the file.  Each of these
       processes opens the appropriate typewriter for reading and writing.  These channels thus receive file descriptors 0, 1 and 2, the  standard
       input,  output  and  error  files.   Opening  the typewriter will usually involve a delay, since the open is not completed until someone is
       dialed up and carrier established on the channel.  Then /etc/getty is called with argument as specified by the last character of  the  ttys
       file line.  Getty reads the user's name and invokes login(1) to log in the user and execute the shell.

       Ultimately  the	shell  will  terminate because of an end-of-file either typed explicitly or generated as a result of hanging up.  The main
       path of init, which has been waiting for such an event, wakes up and removes the appropriate entry from the file utmp, which  records  cur-
       rent  users,  and  makes  an  entry  in /usr/adm/wtmp, which maintains a history of logins and logouts.	Then the appropriate typewriter is
       reopened and getty is reinvoked.

       Init catches the hangup signal SIGHUP and interprets it to mean that the system should be brought from multi  user  to  single  user.   Use
       `kill -1 1' to send the hangup signal.

FILES

       /dev/tty?, /etc/utmp, /usr/adm/wtmp, /etc/ttys, /etc/rc

SEE ALSO

       login(1), kill(1), sh(1), ttys(5), getty(8)

																	   INIT(8)