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From: Jeff Clough <jeff@chaosphere.com>
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Subject: Re: SLIME and CTRL-D
Date: Fri, 09 Apr 2010 08:07:24 -0400
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Peter Keller <psilord@merlin.cs.wisc.edu> writes:

> Helmut Eller <eller.helmut@gmail.com> wrote:
> ... I just know C-u to be a "do this N times" 
> command, so relating it to stdin was surprising.

In Emacs, C-u specifies the prefix argument, which *may* be a repetition
count, but sometimes simply changes the behavior of the command.

I think the canonical example of this is fill-paragraph.  If you give it
a prefix argument, it ignores the value but interprets the presence of
the argument to mean "justify the paragraph too".

Jeff