There is PDP-11 command (one word, 16 bits) which makes a copy of itself into a previous word (with address, in bytes, less by two) and passes the control to th

There is PDP-11 command (one word, 16 bits) which makes a copy of itself into a previous word (with address, in bytes, less by two) and passes the control to the new copy. Octal 103737... or something like that. Doesn't require make :) or cp and is pretty active - fills up all the memory space below the starting point in no time.