I often enjoy listening the Brian Kernighan reminisce and foretell. Witness Coffee with Brian Kernighan - Computerphile https://youtu.be/GNyQxXw_oMQ
This 28 minute conversation between Professor Brailsford and Brian Kernighan begins with stories about awk(1). Eventually they start to talk about text processing and the question of how the next AWK book will be written. Naturally troff(1) and groff(1) come up. That part of the conversation starts here: https://youtu.be/GNyQxXw_oMQ?t=1312 -- Mike Bianchi