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

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 ...

In a previous column, I showed how to do substring expansion with shell variables in the form of $ {var:start:length}, but it's also useful to know the length of a variable's value. This can be done ...

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.

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?