On Wed, May 25, 2005 at 02:02:14PM -0700, Carl Lowenstein wrote:
...
> "report unique IP addresses and
> how many of each".
> 
> Here is a bit of script that I got from comp.lang.awk, I think.  It
> pulls IP adresses out of fairly arbitrary messed-up text streams.  The
> technique is to use tr(1) to get rid of everything that is not a digit
> or a dot by mapping them to newline (\012) and squeezing out duplicate
> newlines.
...
Changing everything undesirable to a newline is a very neat trick and
should also work for other purposes and in other languages.  I
doubt that I'm the only one who has never thought of changing anything
except other separators into newlines.  Thanks.

Stewart Strait


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