Which is the right way to drop caches in Lubuntu?

I am currently using Lubuntu 18.04

I thought that theese are the 3 right code lines to drop cache:

sync; echo 1 > /proc/sys/vm/drop_caches
sync; echo 2 > /proc/sys/vm/drop_caches
sync; echo 3 > /proc/sys/vm/drop_caches

I've tried three all with and without sudo and the output is permission denied.

 sudo sync; echo 1 > /proc/sys/vm/drop_caches
bash: /proc/sys/vm/drop_caches: Permission denied

I have all windows closed, no applications running but still permission denied...

I am clearly doing something wrong, Could anyone tell me which is the right way to drop caches in Lubuntu?

Thanks in advance

1

2 Answers

Finally I found something that works...

sync
sudo sh -c "echo 1 > /proc/sys/vm/drop_caches"
sync
sudo sh -c "echo 2 > /proc/sys/vm/drop_caches"
sync
sudo sh -c "echo 3 > /proc/sys/vm/drop_caches"

And if you want to drop thumbnails make this:

rm -v -f ~/.cache/thumbnails/*/*.png ~/.thumbnails/*/*.png rm -v -f ~/.cache/thumbnails/*/*/*.png ~/.thumbnails/*/*/*.png

Of course you should use:

sudo apt clean
sudo apt autoclean

And that would be all... At least I thought so... but I may be wrong...

0

The easiest way is with a script lifted here:

#!/bin/bash
if [[ $(id -u) -ne 0 ]] ; then echo "Please run as root" ; exit 1 ; fi
sync; echo 1 > /proc/sys/vm/drop_caches
sync; echo 2 > /proc/sys/vm/drop_caches
sync; echo 3 > /proc/sys/vm/drop_caches

Call the script drop-caches.

Mark it as executable using chmod a+x drop-caches

Call it using sudo ./drop-caches

If you place the script in /usr/local/bin you can call it using sudo drop-caches

4

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