UUCP

~ the last words ~

i came online in 1998, on a dial-up account in Ankara that handed me a PPP connection and an email address that just worked. i never had to think about how the mail actually crossed the country. UUCP is the answer to a question i was one layer too late to ask. it was the network PPP quietly replaced, and by the time i plugged in a modem it was already a thing you read about rather than used.

as an engineer i know the shape of it, the way you know a road that was paved over before you learned to drive. UUCP stood for Unix-to-Unix Copy, written by Mike Lesk at Bell Labs and shipped with Version 7 Unix in 1979. it did one stubborn thing well. one Unix machine would phone another over a modem and hand off a batch of files and mail before hanging up. the next machine would phone the one after that. store and forward, all the way across a continent, mostly at night when the long-distance rates dropped.

the addressing is the part people remember. there was no global directory. you routed a message by writing out the exact chain of machines it had to pass through, names punched together with exclamation marks, the bang path. a message might travel through three or four hosts you had to know by name. a whole volunteer effort, the UUCP Mapping Project, existed just to publish who connected to whom so software could work out a route.

what killed it was the internet arriving for everyone else. once ISPs sold cheap SLIP and PPP accounts, a machine could hold an always-on link and speak TCP/IP directly. SMTP took over the mail and NNTP took over the news, and nobody needed to phone the next machine in the chain anymore. the Mapping Project formally shut down in late 2000, which is as good a headstone date as any. the world it mapped had already dissolved.

~ the record ~

~ what came after ~

UUCP lost, but it wrote things down that everyone kept. the store-and-forward idea, hold a message until you can pass it on, is still how mail queues behave when a server is unreachable. the bang path taught a generation to think about routing by hand before the domain name system made addresses look flat and simple. even the @ in your email address is standing where a messier chain of exclamation marks used to be.

~ the long tail ~

the strange thing about a protocol is how long it twitches after it dies. UUCP kept running in corners for years, on links where nothing better existed. a Dutch provider, XS4ALL, only closed its UUCP service in 2012, by then calling itself probably one of the last such providers on earth, with all of thirteen users left. that is the true end of a network, not a shutdown notice, just the last few people who still had a reason finally letting go.

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