[PATCH v3 (resend)] tee: Add -q, --quiet, --silent option to not write to stdout

[Rodney W. Grimes]

> On Sun, Jan 24, 2021 at 9:04 PM Bernhard Voelker
> <mail at bernhard-voelker.de> wrote:
> >
> > An off-tech argument: ask a local plumber if he'd would ever use
> > a tee piece instead of a pipe end piece.  I guess he would only
> > if he wouldn't have anything else at hand.
> 
> According to POSIX, tee writes to "zero or more files."[1] So the
> "local plumber" analogy already doesn't hold, because a plumber would
> never put in a tee and then immediately cap it off so that the flow

Actually plumbers do this all the time, its a stub out for future
additions/alterations.  There is also a special case of it done
when plumbing air/gas lines called a trap.

> can only go to one place, but commands like `echo foo | tee | tee |
> tee` are already explicitly allowed.
> 
> > A word to the proposed patch: what should happen, if the user does
> > not give a file?
> >   A | B | tee -q
> > The patch just silently ignored that situation which feels wrong.
> 
> Personally, I like the idea of only having to type `echo foo | tee -q`
> instead of `echo foo > /dev/null`, so I think the patch indeed does
> the right thing in that case.
> 
> -Alex
> 
> [1] https://pubs.opengroup.org/onlinepubs/9699919799/utilities/tee.html
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-- 
Rod Grimes                                                 rgrimes at freebsd.org