test.cpp

#include <iostream>    // for using std, printf(),...
#include <unistd.h>    // for using fork(), execl()

int main(int argc, char** argv)
{
	printf("Hello world\n");
	
	execl("/bin/ls", "-ltr", (char*)0);
		
	printf("Goodbye\n");

	return 0;
}

/*
OUTPUT:
Hello world
mylib  test  test.cpp
*/