Write a shell that is similar to Fig. 1-10 but contains enough code that it actually works so you can test it. You might also add some features such as redirection of input and output, pipes, and background jobs.

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while (TRUE) { type_prompt(); } read command (command, parameters); if (fork() != 0) { /* Parent code. */ } waitpid (-1, &status, 0); } else { /* Child code. */ execve(command, parameters, 0); /* repeat forever */ /* display prompt on the screen */ /* read input from terminal */ /* fork off child process */ /* wait for child to exit */ /* execute command */ Figure 1-10. A stripped-down shell. Throughout this book, TRUE is assumed to be defined as 1.