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

[Alejandro Colomar (man-pages)]

On 1/27/21 6:00 PM, L A Walsh <coreutils@tlinx.org> wrote:
> On 2021/01/26 05:57, Rodney W. Grimes wrote:
>
> > > So, I would remove '-i, --input-stream'.  (And if you think it's
> > > missing, maybe write a program to read from any FD and write to stdout.)
>
> > Its name is cat(1)
> > cat /dev/fd/# >outputfile
> >    
> ----
>      Except the problem, which I've run into before, is to
> have such a command executable by 'root' and output by 'root',
> Have you ever tried to drop your file caches?
> need to echo "3" to /proc/sys/vm/drop_caches.  Except if you are
> a normal user, you need to elevate to root first, but what you
> suggest won't work:
>
>     echo "3" | sudo cat >/proc/sys/vm/dropcaches
> -bash: /proc/sys/vm/drop_caches: Permission denied
>
> Cat isn't writing the file -- bash is.  I ended up using
> dd at the time, but tq seems more efficient:
>
> echo "3" |sudo tq /proc/sys/vm/dropcaches
>
> (which does work).

If I understood correctly, Rodney meant:

sink -i4 outputfile
==
cat /dev/fd/4 | sink outputfile

minimizing the concerns of 'sink' ('sink' as proposed by Berny, or 'tq', 
as L A Walsh named it) to just writing, and read only from stdin.


Cheers,

Alex


--
Alejandro Colomar
Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es/