Yahoo access logs used control characters to separate fields beyond a fixed width field, but it wasn't the record separators. It used ctrl-E to separate fields,

Yahoo access logs used control characters to separate fields beyond a fixed width field, but it wasn't the record separators. It used ctrl-E to separate fields, which had a one character identifier. Some of the fields had sub-fields which were separated ctrl-F. Slide 22 https://www.radwin.org/michael/talks/yapache-oscon2006.pdf https://www.radwin.org/michael/talks/yapache-oscon2006.pdf