Variables often look like $var, but they also look like $1, $*, $? and $$. Let's take a look at what all these $ values can tell you. A lot of important values are ...

The eval command allows you to run the contents of variables as commands and can be very useful, especially in scripts. There are probably a lot of Linux users who have never encountered the eval ...

The Linux command line is a powerful tool that gives you complete control over your system. But to unleash its full potential, you must understand the environment in which it operates. One crucial ...