Linux Hint published an introduction to Bash environment variables.
What are Bash Environment Variables
In computing, variable is a term that can be used to assign it any value or to use the variable dynamically in accomplishing the specific task. For instance, programmers declare variables by any symbol (alphabetical letters mostly) and can be used to act as a different value in several programs. Our operating systems have a list of variables that are used to manipulate the programs or processes in a computer and are known as environment variables. This article explains environment variables in bash.
