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 ...

Using environment variables is one of the ways that Windows communicates information such as the location of system files and folders -- as set up on your particular computer -- to programs.

A batch file is a script file that stores commands to be executed in a serial order. It helps automate routine tasks without requiring user input or intervention. Some common applications of batch ...

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 ...

Jack Wallen introduces you to Linux environment variables. What are they and how are they set and unset? How many times have you installed something on Linux, only to find out that you need to set ...