<wob_jonas> perl -eopen$i,"<",($f="wisdom/aristotle");$_=<$i>; s/(alphabet).*/$1 doesn\'t have the letter C.\\n/ or die; open$o,">",$f; print$o $_ or die; print substr$_,300;

`4 <cmd> is equivalent to `5 <cmd>, except that it only repeats 4 times. Useful when you've already run a command forgetting to use `5.