*BSD News Article 97345


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From: david@mudshark.micro.ti.com (David A Thomas)
Newsgroups: comp.unix.shell,comp.os.linux.misc,comp.unix.bsd.misc
Subject: Re: unix acronyms -collecting a list?
Followup-To: comp.unix.shell,comp.os.linux.misc,comp.unix.bsd.misc
Date: 8 Jun 1997 05:19:18 GMT
Organization: Texas Instruments, Houston
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References: <5kd2ng$c8b$1@rzsun02.rrz.uni-hamburg.de> <338B012B.4C3B@att.com>
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Allen Kirby (akirby@att.com) wrote:
> [...many attributions lost...]
> > > > > dd = Data Dump (At least I always thought so)
> > > > Device Dump
> > > Sure about that one? The functionality of
> > > dd if=/tmp/myfile conv=ascii of=/tmp/newfile
> > > wouldn't make sense if the command were truly a device
> > > level operator.

> Ken Thompson confirmed that the origin of 'dd' was a joke on the IBM
> 'dd' mainframe command, which I believe stood for 'define data'.

The 'dd' command is indeed an *imitation* of many of the conversions
provided by the DATA DEFINITION (DD) statement in System 360-370 JCL.
It's no joke.
--
David Thomas                       (david-at-micro-dot-ti-dot-com)
Texas Instruments, Houston                          (281)-274-2347