( why programs that do nothing can come in handy )

So nullfilter, despite my having originally assumed it would be a completely useless program for actually using, has proved its worth repeatedly in the last month and in fact might well end up being the one of my filter programs from which I get the most ongoing use!

I almost feel there ought to be a moral here. Perhaps it should be a comment I recall once seeing posted on a newsgroup by (I think) pm215: ‘never neglect the trivial case’.