How does the shell display the value of a variable?

In Shell, you can use the echo command to display the value of variables. Here are some examples:

1. Display the value of the variable:

variable="Hello World"
echo $variable

Output: Hello World

1. Display the value of a variable in a string printed out.

name="John"
echo "My name is $name"

Output: I am called John.

1. Values of multiple variables:

name="John"
age=25
echo "My name is $name and I am $age years old"

Output: I am 25 years old and my name is John.

Please note that you can reference the value of a variable by adding the $ symbol before the variable.