"The Art of Unix Programming" by Eric Steven Raymond(esr)
http://www.catb.org/esr/writings/taoup/html/
start: 2020-07-04 end: 2022-09-24 18:52:32
# see history
commit_before_renaming=46c16f2; git checkout $commit_before_renaming && tig the-art-of-unix-programming
# go back
git checkout main- TODO question: how to understand "Separation of mechanism and policy" ?