The eval command allows you to run the contents of variables as commands and can be very useful -- especially in scripts.

Testing variables There are quite a few ways to test the values of variables, but the operators you need to use depend on whether you’re comparing numbers or strings.

One crucial component of the Linux environment is the PATH variable. It's like a guide that directs the system to where it can find the programs you're asking it to run. In this article, we will delve ...

At this point, I'm basically just grasping at straws, as I've reached the limit of my Linux knowledge. How can I get these environment variables to be visible to every process on boot?

Another special variable that you might have encountered is the status variable, $?. In a script, this contains the return value of the most recently executed (external) command. This is where you ...