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My knowledge about useful/funny /dev files grows by the day...
I now know of: random & urandom, null, zero and now full...
Bouta make an infinity gauntlet meme of them
Wait until you learn about the shell specific /dev "files" like /dev/udp and /dev/tcp (which can send/recv IP traffic as if from a file)!
The bottom of that Wikipedia page has a reference to something else that sounded interesting called “/dev/mordor” in some Plan 9 OS fork called 9front. Sent me down a really interesting rabbit hole http://9front.org/
9front is a great rabbit hole. Plus, Plan9's mascot is Glenda, the rabbit.
Maybe I can finally get my pull merged for /dev/grohl which just outputs random Foo Fighters lyrics.