The newest version of the sed FAQ is usually here:
https://sed.sourceforge.net/sedfaq.html (HTML version) https://sed.sourceforge.net/sedfaq.txt (plain text) https://www.student.northpark.edu/pemente/sed/sedfaq.html https://www.student.northpark.edu/pemente/sed/sedfaq.txt https://www.faqs.org/faqs/editor-faq/sed ftp://rtfm.mit.edu/pub/faqs/editor-faq/sed
Another FAQ file on sed by a different author can be found here:
https://www.dreamwvr.com/sed-info/sed-faq.html
