Article View: sci.space.shuttle
Article #6180Re: Spinning Shuttle
From: Larry Wall
Date: Thu, 01 Feb 1990 22:07
Date: Thu, 01 Feb 1990 22:07
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In article <48518e97.1766d@june.engin.umich.edu> stealth@caen.engin.umich.edu (Mike Peltier) writes: : In article <19500002@hpfipgt.HP.COM> pgt@hpfipgt.HP.COM (Paul Tobin) writes: : > : > Standard : >procedure is for the shuttle to echo the received data back down for : >comparison with the original data. This was done, but the HUMAN : >operator failed to note the mismatch! Somebody was asleep at the : >wheel. : : Why was a human relied upon to determine whether or not the data : matches? That seems sorta silly, when you can just do something : similar to "cat echoed_data | diff - real_data | wc -l" and test : that against zero. If it's not, simply retransmit. I don't see any : need for a human in that loop. Then some wise guy says "ls -l *_data" and discovers that neither file has been modified in the last 11 months... Or that echoed_data and real_data are hard links to the same file... Larry Wall lwall@jpl-devvax.jpl.nasa.gov
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!samsung!brutus.cs.uiuc.edu!jarthur!elroy.jpl.nasa.gov!jpl-devvax!lwall From: lwall@jpl-devvax.JPL.NASA.GOV (Larry Wall) Newsgroups: sci.space.shuttle Subject: Re: Spinning Shuttle Message-ID: <6966@jpl-devvax.JPL.NASA.GOV> Date: 1 Feb 90 22:07:47 GMT References: <36192@cornell.UUCP> <19500002@hpfipgt.HP.COM> <48518e97.1766d@june.engin.umich.edu> Reply-To: lwall@jpl-devvax.JPL.NASA.GOV (Larry Wall) Organization: Jet Propulsion Laboratory, Pasadena, CA Lines: 20