See the Multics History Project:<p><a href="https://people.csail.mit.edu/saltzer/Multics/Multics-Documents/" rel="nofollow">https://people.csail.mit.edu/saltzer/Multics/Multics-Documen...</a>
More context here, <a href="https://multicians.org/shell.html" rel="nofollow">https://multicians.org/shell.html</a>
by Louis Pouzin himself, a not-so-well known father of the Internet.