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 ...

I've added some environment variables to /etc/profile and /etc/bashrc, but when I run commands with sudo, they're not there—sudo env does not list them. Is there some other profile I should be editing ...

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 ...