What do you mean ESR's book hasn't aged well?
Heya, I haven't read the Unix one, I was talking about the Cathedral and the Bazaar.
Honestly I wanted to like it and was stoked to come across it as there are so few books on the topic (and at the time also wasn't aware of ESR's now-bad rep, actually as an emacs user myself I though highly of him) and I was trying everything I could in the area because I was prepping a talk for PyCon US.
It pre-dates distributed version control (ie git) and comes from a time when freshmeat.net was the coolness for FOSS, how many people even remember that now? github wasn't even imaginable from the place where that book is written.
It's about emailing patches and old skool hax0r behaviour, that time is just past and really not that relevant to anyone who wasn't there.
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