Question

explain the types of shell variable

Answer 1

A shell variable is a variable that is available only to the current shell. In contrast, an environment variable is available system wide and can be used by other applications on the system. A shell is the operating system's command interpreter.
Variable Types. Local Variables − A local variable is a variable that is present within the current instance of the shell. It is not available to programs that are started by the shell. They are set at the command prompt.