On Mon, Aug 15, 2022 at 11:13:07AM +0300, Anssi Saari wrote: > Timothy M Butterworth <timothy.m.butterworth@gmail.com> writes: > > > When I run `sudo echo 1 > /proc/sys/vm/drop_caches` I receive the following error: bash: /proc/sys/vm/drop_caches: Permission denied > > Unfortunately, it's your current shell and not root who does the > redirection in this case so no permissions. > > For a longer explanation see > https://www.reddit.com/r/linux4noobs/comments/qq76qo/sudo_echo_vs_echo_from_the_root_shell/ > > A proposed alternative from there is to use tee, like this: > > echo 1 | sudo tee /proc/sys/vm/drop_caches To add another one, I like dd for that one (it doesn't clutter stdout unnecessarily). echo 1 | sudo dd of=/proc/sys/and-so-on Embarrasment of riches! Basically, what one is looking for is a cat one can pass an output file name as a command line argument -- or put another way, a cat which opens its output itself. Cheers -- t
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