Working with Bash shell variables

In this section, we will introduce you to Linux Bash shell variables. Bash shell variables are a great way to give symbolic names to any dynamic values, so we can reference values by a name. This helps to create very flexible and convenient systems where you often only have to change a single value, and all processes on your computer accessing this value can change their behavior automatically. Using shell variables provides a simple way to share configuration settings between multiple applications and processes in Linux, as we will see in the next section. To define a new environment variable, use the following syntax MY_VALUE=1, name of the variable equals, then the value. All Bash shell variables must not contain spaces or special characters, and, by convention, often shell variables are all uppercase. To access the stored value of the shell...