Great to see that at some point IU.edu had an Emacs KB. Sadly this has been archived. It still contains relevant information though - such as how M-x text-mode would get out of trouble when the other mode you’re using gets too slow or broken (in my case markdown-mode ).
This edvideo has an interesting bash command (!clear.sh), which prints column numbers at the very top of ed.
recommendation: use e !indent %; cat %
the shell script used in the video to show column count at the very top (+8 +16 +24 etc.):
).