System 5 rc (rc, not init, note) didn't have such a concept. Even the original van Smoorenburg clone of rc didn't have this. The LSB headers came along some y

System 5 rc (rc, not init, note) didn't have such a concept. Even the original van Smoorenburg clone of rc didn't have this. The LSB headers came along some years later. They are one of two different header styles that systemd's conversion tool understands, in addition to supporting the case where there are no headers at all. There are multiple extensions to van Smoorenburg rc. The LSB headers are just one such extension, understood by toolsets on some operating systems and not others. * http://unix.stackexchange.com/a/233581/5132 http://unix.stackexchange.com/a/233581/5132