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

[L A Walsh]

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).