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

[Christian Groessler]

On 1/27/21 3:01 AM, L A Walsh wrote:

> 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.


What is so difficult with

$ echo "3" | sudo sh -c "cat > proc/sys/vm/dropcache"

I don't get it...

regards,
chris



>   I ended up using
> dd at the time, but tq seems more efficient:
>
> echo "3" |sudo tq /proc/sys/vm/dropcaches
>
> (which does work).