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fork() / exec() Example fork() int child_pid; foo as P1 switch (child_pid = fork ()) { case -1: perror (fork") exit (EXIT_FAILURE); // or recover foo as P1 parent case 0: // You are in the child execlp (echo", hello, world!, NULL); perror (execlp"); exit (EXIT_FAILURE); // or recover (foo as P2 exec("bar") default: // You are in the parent // No zombies! waitpid (child_p, ...); foo as P1 bar as po parent