Bash Shell Scripting - Global variables, and Variable Scope

This video tutorial delves into the concepts of variables, focusing on global and environment variables, and their scope within scripts. It explains how variables are declared, used, and how their values can be overwritten. The tutorial also covers the concept of subshells and how variable scope is limited to the shell in which they are declared. Additionally, it introduces global variables and the use of the 'export' keyword to make variables accessible across subshells. Practical examples are provided to illustrate these concepts.

Can you overwrite the value of a variable in a script? Explain how.

What will happen if you try to echo a variable that has not been declared?

What is the difference between a variable declared in a script and one declared in the command line?

How does the execution of a script in a subshell affect variable accessibility?