Error message output

[Steve O'Hara-Smith]

On Sun, 20 Sep 2020 22:12:24 -0700
David Christensen <dpchrist at holgerdanske.com> wrote:

> I have been migrating my programming style towards a data flow paradigm, 
> which includes "command-line filters".  So, an "ideal" command-line 
> program or script would:
> 
> * Use stdin for the input data.
> 
> * Use stdout for the output data.
> 
> * Use configuration files, command-line options and arguments, received 
> signals and direct tty reads for out-of-band/ non-data input.

	This is where the standard set of unix devices is lacking, I have
long thought that there should be a stdctl then stdin/stdout are data flow
and stdtctl/stderr are control flow.

> * Use stderr, log files, and the exit value for out-of-band/ non-data 
> output.

-- 
Steve O'Hara-Smith <steve at sohara.org>