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2 definitions found
 for bang path
From The Jargon File (version 4.4.7, 29 Dec 2003) :

  bang path
   n.
  
      [now historical] An old-style UUCP electronic-mail address specifying hops
      to get from some assumed-reachable location to the addressee, so called
      because each hop is signified by a bang sign. Thus, for example, the
      path ...!bigsite!foovax!barbox!me directs people to route their mail to
      machine bigsite (presumably a well-known location accessible to everybody)
      and from there through the machine foovax to the account of user me on
      barbox.
  
      In the bad old days of not so long ago, before autorouting mailers and
      Internet became commonplace, people often published compound bang addresses
      using the {  convention (see glob) to give paths from several big
      machines, in the hopes that one's correspondent might be able to get mail
      to one of them reliably (example: ...!{seismo, ut-sally, ihnp4!rice!beta!
      gamma!me). Bang paths of 8 to 10 hops were not uncommon. 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 not infrequently get lost. See the network and sitename.
  

From The Free On-line Dictionary of Computing (30 December 2018) :

  bang path
  
     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
  
     	...!bigsite!foovax!barbox!me
  
     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.
  
     (1998-05-06)
  

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