Linux Shell Scripting Essentials

Define variables of choice

Now we know how to write a simple hello world shell script. Next, we will be getting familiar with variables in shell and how to define and use variables in shell.

Nomenclature

A variable name can be a combination of alphanumeric and underscore. Also, the name of the variable can't start with a number. The variable names in shell script are case-sensitive. Special characters, such as *, -, +, ~, ., ^, and so on, are not used in variable names because they have a special meaning in shell. The following table illustrates the correct and incorrect ways of naming a variable:

Correct variable names	Incorrect variable names
variable	2_variable
variable1	2variable
variable_2	variable$
_variable3	variable*^

Assigning ...