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Date: Wed, 23 Oct 2019 06:08:55 +1000
From: Warren Toomey <wkt@tuhs.org>
To: Abhinav Rajagopalan <abhinavrajagopalan@gmail.com>
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Subject: Re: [TUHS] What was your "Aha, Unix!" moment?
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On Tue, Oct 22, 2019 at 07:52:32PM +0530, Abhinav Rajagopalan wrote:
>    On a somewhat related note, if someone could shine some light on, if
>    such chdir() which wasn't yet integrated into the shell function
>    independent of fork() as in did fork() just spawn off a new child shell
>    if one did chdir() or more generally how did processes interact when/if
>    more than one child existed. I know PDP-7 had some archaic IPC but
>    haven't gotten around to grokking fork.s or others to understand the
>    actual operation.

The best place to learn all this is Dennis' paper on the Evolution of Unix:
http://www.read.seas.harvard.edu/~kohler/class/aosref/ritchie84evolution.pdf

Cheers, Warren