How to simulate login as root using sudo command
Answer:
While this is a bad idea, but can be quite handy as you don't need to type sudo all the times
# sudo -i
[sudo] password for john:
root@/:~
Permission denied when redirection with sudo
Answer:
When you are doing redirection with sudo, such as the following command
# sudo echo 1 > /proc/sys/vm/drop_caches
-bash: /proc/sys/vm/drop_caches: Permission denied
You will get permission denied as the redirection will be performed as the user calling sudo, not as the superuser. So if you don't have permission to write to the target file, you will get permission denied.
To solve the problem, use the following method
sudo sh -c 'echo 1 > /proc/sys/vm/drop_caches'
