docs: Added UNIX V10 Manuals

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+.pa 1
+.he 'INIT (VII)'6/15/72'INIT (VII)'
+.ti 0
+NAME		init  --  process control initialization
+.sp
+.ti 0
+SYNOPSIS	/etc/init
+.sp
+.ti 0
+DESCRIPTION
+.in 8
+init____
+is invoked inside UNIX as the last step in the boot procedure.
+Generally its role is to create a process for each
+typewriter on which a user may log in.
+
+First, init____ checks
+to see if the console switches contain 173030.
+(This number is likely to vary between
+systems.)
+If so, the console typewriter tty___ is opened for reading
+and writing and the shell is invoked immediately.
+This feature is used to bring up a test system, or one
+which does not contain DC-11 communications interfaces.
+When the system is brought up in this way, the getty_____
+and login_____ routines mentioned below and described elsewhere are not needed.
+
+Otherwise, init____ does some housekeeping: the mode of
+each DECtape file is changed to 17 (in case the system
+crashed during a tap___ command);
+directory /usr is mounted
+on the RK0 disk;
+directory /sys is mounted on the RK1 disk.
+Also a data-phone daemon
+is spawned to restart any jobs being sent.
+
+Then init____ forks several times to create a process
+for each typewriter mentioned in an internal table.
+Each of these processes opens the appropriate typewriter
+for reading and writing.  These channels thus
+receive file descriptors 0 and 1, the standard input and
+output.
+Opening the typewriter will usually involve a delay,
+since the open____ is not completed until someone
+is dialled in (and carrier established) on the channel.
+Then the process executes the program /etc___/getty_____
+(q.v.).
+getty_____ will read the user's name and invoke login_____ (q.v.)
+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 current users, and
+makes an entry in wtmp____, which maintains a history
+of logins and logouts.
+Then the appropriate typewriter is reopened and getty_____
+reinvoked.
+.sp
+.in 16
+.ti 0
+FILES		/dev/tap?,
+/dev/tty, /dev/tty?, /tmp/utmp, /tmp/wtmp
+.sp
+.ti 0
+SEE ALSO	login(I), login(VII), getty(VII), sh(I), dpd(VII)
+.sp
+.ti 0
+DIAGNOSTICS	none possible
+.sp
+.ti 0
+BUGS		none possible