A practical tip on how to avoid cached results when looking up DNS records.

Stop using root for administrative tasks. Here is how to add a new user to the sudoers list in Ubuntu.

The utility command grep has a more powerful brother that let us use POSIX Extended Regular Expressions.

How to display the total of the current directory or a particular directory, as well as listing subtotals (subdirectories).

A two step way using the defaults command to hide the icons from the desktop in Mac OS X.