Learn Linux Shell Scripting - Fundamentals of Bash 4.4

Summary

At the start of this chapter, we explained what a variable was: a standard building block that allows us to store information, which we can reference later. We prefer to use variables for a number of reasons: we can store a value once and reference it multiple times, and if we need to change the value, we only have to change it once and the new value will be used everywhere.

We explained that a constant is a special type of variable: it is defined only once in the beginning of a script, it is not affected by user input, and it does not change during the course of the script execution.

We continued with some notes on variable naming. We demonstrated that Bash is very flexible with regard to variables: it allows many different styles ...