Long description

The program code is as follows:

# define TRUE 1

while (TRUE) Start Parenthesis. It has a comment repeat forever.

type_prompt ( ) semicolon. It has a comment display prompt on the screen.

read_command (command, parameters) semicolon. It has a comment read input from terminal.

if (fork ( ) not equal to 0) Start Parenthesis. It has a comment fork off child process.

Comment is parent code.

wait pid (baseline equals 1, & status, 0) semicolon. It has a comment wait for child to exit.

End Parenthesis else Start Parenthesis

Comment is child node.

execve (command, parameters, 0) semicolon. It has a comment execute command.

End Parenthesis