You can find the original yacc and lex papers in Google scholar and elsewhere by the way. I haven't checked for m4 yet though. Original ed(1) paper here too [1]

You can find the original yacc and lex papers in Google scholar and elsewhere by the way. I haven't checked for m4 yet though. Original ed(1) paper here too [1] 1. http://www.verticalsysadmin.com/vi/a_tutorial_introduction_to_the_unix_text_editor.pdf http://www.verticalsysadmin.com/vi/a_tutorial_introduction_t...