[TUHS] Shell control through external commands

[Peter Jeremy]

On 2016-Jul-15 08:36:56 +1000, Dave Horsfall <dave at horsfall.org> wrote:
>On Thu, 14 Jul 2016, Clem Cole wrote:
>> Could you be confusing the fact the true and false were implemented by
>> external commands in some early shell's

I was always amused by AT&T adding a multi-kB copyright notice to what
had previously been an empty file.

>And on the Mac and FreeBSD, they still are (as well as being builtins).

FreeBSD provides a convenient list of what commands are (currently) builtin
to the provided shells and available externally:
https://www.freebsd.org/cgi/man.cgi?builtin

-- 
Peter Jeremy
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