Programming

    switch(pid)
    {
        case -1:  
            cout << "DEBUG:Fork Failure" << endl;
            exit(-1);
            break;

        case  0:
            execvp(cmd[0], cmd);
            
            if(execvp(cmd[0], cmd) == -1)
            {
                cout << "Command Not Found" << endl;
                exit(0);
            }
            break;
   
        default:  
            wait(NULL);
            cout << "DEBUG:Child Finished" << endl;
            break;
    }

#include <sys/wait.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <string>
#include <iostream>
#include <stdlib.h> 

using namespace std;

bool ParseArg(char* cmnd, char* cmd[], char input[],bool BG)
{
		
        cout << "myshell> ";
        cin.getline(input,50);
	cmnd = strtok(input, " ");
	int i = 0;

	while(cmnd != NULL)
	{
	    
	    cmd[i] = cmnd;
	    if(strcmp(cmd[i], "&") == 0){
//Debug	    cout << "& found";
	    cmd[i] = NULL;
	    return true;
	}
	    
//Debug	    cout << cmd[i] << " ";
	    i++;
	    cmnd = strtok(NULL, " ");
	}
	return false;
}

void Clean(char* cmd[])
{
//Clean Array
        for(int a=0; a < 40; a++)
        {
             cmd[a] = NULL;
        }
}

void Execute(char* cmd[])
{
    pid_t pid;
    pid = fork();
    switch(pid)
    {
        case -1:  
            cout << "DEBUG:Fork Failure" << endl;
            exit(-1);
        case  0:
            execvp(cmd[0], cmd);
            
            if(execvp(cmd[0], cmd) == -1)
            {
                cout << "Command Not Found" << endl;
                exit(0);
            }
   
        default:  
            wait(NULL);
            cout << "DEBUG:Child Finished" << endl;
    }
    
}

int main()
{
   char* cmnd;
   char* cmd[40];
   char input[50]; 
   bool BG = false;

	

   while(cmd[0] != NULL)
   {
    	Clean(cmd);
   	BG = ParseArg(cmnd, cmd, input, BG);
	cout << BG;
   	if(strcmp(cmd[0], "exit") == 0 || strcmp(cmd[0], "quit") == 0 )
   	{
             break;
   	}
	else
	{
            Execute(cmd);
	}
	
   }

   return 1;

}