"Permission denied" is an indication that you do not have sufficient access to perform the desired operation. Permission restrictions help ensure that you do not modify something required for the system to function properly. Though it is sometimes necessary to modify restricted files / director ...
The sudo command allows users to perform tasks as another user - most commonly, the root user. Using sudo instead of su - has significant advantages. Most notably is that all operations performed with sudo are logged to /var/log/secure. To use the sudo command, the user (in this article, the us ...