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ft18
Asked: 2018-12-03 20:10:22 +0800 CST

Which is the right way to drop caches in Lubuntu?

  • 772

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

permissions lubuntu cache

2 Answers

  1. Best Answer

    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...

    • 7

  2. 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

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