#include <iostream>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>


using namespace std;

int main(int argc, char * argv[]) {
    char * filename = "/bin/ls";
    char * args[] = {"demo program", "-alrt",".",NULL};
    char * envp[] = {NULL};

    cout << endl;
    cout << "Hello, this is from demo.C" << endl;
    cout << "And my pid is " << getpid() << endl;

    cout << endl;

    if (argc < 2) {
        cout << "Running " << filename << endl;
	cout << endl;
        execve(filename, args, envp);
    } else {
        cout << "Running " << argv[1] << endl;
	cout << endl;
        execve(argv[1], args, envp);
    }

    perror("Exec: ");
    cout << "After the execve" << endl;

    return 0;
}