<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;

`revert <rev>" can be used to revert to a revision. See <https://hackego.esolangs.org/fshg/>. It is a builtin command so cannot be called from other commands.