Bash: /Proc/Sys/Vm/Drop_Caches: Permission Denied
$ Echo 3 > /Proc/Sys/Vm/Drop_Caches Bash: /Proc/Sys/Vm/Drop_Caches: Permission Denied Tried with the System Password. but Still Failing. 5 3 Answers Execute...
$ echo 3 > /proc/sys/vm/drop_caches
bash: /proc/sys/vm/drop_caches: Permission denied
Tried with the system password. But still failing.
3 Answers
Execute the shell as root:
sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
Or redirect the input to a process that will write to file as root:
echo 3 | sudo tee /proc/sys/vm/drop_caches
There is another possibility (not mentioned in answers here yet) is when you use a OpenVZ server, where even the "root" user may not be able to change the proc values.
Mine had read only permissions for root, and even though group was root, I couldn't change it with chmod.
For more info, refer to answers here:
You should do it with root user. Or atleast should use sudo then command.
sync; echo 3 > /proc/sys/vm/drop_caches
Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.
