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bang path

bang path in Technology

1. An old-style UUCP electronic-mail address naming a sequence of hosts through which a message must pass to get from some assumed-reachable location to the addressee (a "source route"). So called because each hop is signified by a bang sign (exclamation mark). Thus, for example, the path
directs people to route their mail to computer bigsite (presumably a well-known location accessible to everybody) and from there through the computer foovax to the account of user me on barbox.
Before autorouting mailers became commonplace, people often published compound bang addresses using the convention (see glob) to give paths from *several* big computers, in the hope that one's correspondent might be able to get mail to one of them reliably. e.g.
...!seismo, ut-sally, ihnp4!rice!beta!gamma!me
Bang paths of 8 to 10 hops were not uncommon in 1981. Late-night dial-up UUCP links would cause week-long transmission times. Bang paths were often selected by both transmission time and reliability, as messages would often get lost.
2. A shebang.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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