tmp = command;
command = (char *) malloc (strlen (tmp) + 6);
memcpy (command, "exec ", 5);
memcpy (command + 5, tmp, strlen (tmp) + 1);
tmp = command;
command = (char *) malloc (strlen (tmp) + 6);
memcpy (command, "exec ", 5);
memcpy (command + 5, tmp, strlen (tmp) + 1);