[TUHS] History of cal(1)?

[Steffen Nurpmeso via TUHS]

Dave Horsfall via TUHS wrote in
 <alpine.BSF.2.00.2509260628530.88759 at aneurin.horsfall.org>:
 |On Thu, 25 Sep 2025, Clem Cole via TUHS wrote:
 |[...]
 |
 |> and the >>copyright<< was all we were worried about at the time.  You
 |> can do that with any directory that contains source from AT&T and I bet
 |> you'll find them.  They freely put copyright in everything.  Even early
 |> UNIX itself prints a banner when you log in, stating that Western \
 |> Electric
 |> holds the copyright on the product you are using.
 |
 |Heck; at one time the "true" command was a Shell script with a huge
 |copyright notice, followed by... nothing...  (The "false" script
 |actually had "exit 1" at the end.)

And today i programmer am still too apprehensive to remove the
complete copyright notice, leaving only the present

 * SPDX-License-Identifier: ISC

though the Linux kernel (but hey: Linux kernel!) goes that way, as
far as i see.  (Likely via a mostly automatized sed(1) run.
It shortens --copyright output to two lines (minimum), in theory.

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)