On Sat, 9 Nov 2019 10:11:46 +0100
"R.Wieser"  wrote:

> Thanks again.   Some of the info still goes a bit over my head, but
> overall my "picture sharpness" improves. :-)

 For a little historical perspective -before SYSV init there
was /etc/rc and /etc/rc.local - two shell scripts one for the system the
other for the sysadmin. The latter may have been an addition.

 This approach was not conducive to automatic maintenance and so SYSV
init was created as a somewhat over-engineered solution. Over-engineering
was popular in the SYSV camp at the time - another great example was
streams, the SYSV networking stack it was ingenious and incredibly flexible
but sockets were simpler and better matched to the requirements.

 IME nobody ever found real use for more than two run levels
(maintenance and normal operation) hence BSD init which essentially just
adds a directory and some conventions for scripts to manage services to the
original mechanism.

--
Steve O'Hara-Smith                          |   Directable Mirror Arrays
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The computer obeys and wins.                |    licences available see
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