Linux Here you can find all the posts taged with Linux. Adding a user to the sudoers list in Ubuntu Stop using root for administrative tasks. Here is how to add a new user to the sudoers list in Ubuntu. A more powerful version of grep The utility command grep has a more powerful brother that let us use POSIX Extended Regular Expressions. Display disk usage with the du command How to display the total of the current directory or a particular directory, as well as listing subtotals (subdirectories).