I'm really enjoying the book A Retargetable C Compiler: Design and Implementation but reading pre-ANSI C is *weird*.
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An ad hoc, informally-specified, bug-ridden, slow implementation of half of a text adventure game -- or as I like to call it, a compiler.
On thinking of books like software, treating them as evolving artifacts, and URLs versus paper book publishers: https://cs.brown.edu/~sk/Memos/Books-as-Software/
I've been really enjoying paru as a pacman substitute on Arch Linux: https://github.com/Morganamilo/paru
It allows you to update both normal and AUR packages in one go, which is super convenient. It also shows you PKGBUILD files, so there's still a human audit step for AUR.