in reply to Word replace - notetab light vs perl
This is why I like sed ;-)
$ sed -i 's/wrongs/wrongs3/' wrongs [download]
$ perl -i -pe 's/wrongs/wrongs3/' wrongs
This is good if you don't have a recent version of GNU sed (only those have the -i option). I use it often enough that I have alias pp="perl -i -pe".