مساعدة في مشروع Simple Shell Program

Project1: Simple Shell Program
Develop a c/c++ program which serve as s shell interface that accept user command and then execute each command in separate process. The shell interface provides a user prompt ( sh> ) after which next command is entered .
#define TRUE 1
while(TRUE){ //repeat forever
type_prompt(); //display prompt on the screen
read_command (command, parameters); //read input from terminal
if(fork()!=0){ //fork off child process
waitpid(‐1, &status, 0); //wait for child to exit }
else{
execve(command, parameters, 0); //execute command }}
Write a shell that is similar to the above code snippet, but contains enough code that it actually works so you can test it. You might also add some features such as redirection of in input and output, pipes, and background jobs.
If the user enter “& “ at the end of his command, then the process (command) will be executed in the background and the shell WILL not WAIT it to terminate.
You can experience background process yourself by trying the following command on bash shell.
> kwrite
The kwrite application will be run, and the shell prompt will not prompted until you terminate kwrite. BUT if you tried the following command, then the prompt will return to the user to accept other commands while kwrite (child process) is running!
> kwrite & If the user entered exit command, then you will break the loop (exit(0)).
Here is an example of how your shell should work: (italics indicate typed commands)
% ./myshell
sh> echo hello world!
hello world!
sh > emacs test.txt &
process 3456 started
sh > mozilla &
process 3457 started
sh > cp test.txt newfile.txt
sh > exit