Which command is used in Shell Script to display the value of a specific environment variable?

The command used in Shell Script to display the value of a specific environment variable is indeed "echo." This command outputs the text and values you provide to it, making it a versatile choice for displaying information on the terminal.

When you want to view the value of an environment variable, you can use "echo" followed by the variable name prefixed with a dollar sign. For example, using echo $VAR_NAME will display the value stored in the environment variable named VAR_NAME. This allows you to verify and utilize environment variables effectively in your scripts.

Other commands mentioned serve different purposes: "export" is utilized to set environment variables, making them available to child processes; "env" is often used to display all current environment variables, not to display a specific one; and "set" can be used to set shell options or display the values of shell variables, but it is less straightforward for showing a specific environment variable's value.