[ILUG] Sed/tex processing Question

[Kingsley G. Morse Jr.]

Hi Rory,

You might like to visit the #sed channel on
freenode's IRC network.

I also find myself wondering if, instead of
retaining certain parts of the line via
back-references, a better strategy might be to
delete the rest, possibly by employing sed
multiple times in a pipe.

For example, replace 

    echo "abc" | sed 's/.\(.\)./\1/'

with

    echo "abc" | sed 's/a//' | sed 's/c//'

Thanks,
Kingsley

On 03/09/09 17:53, rory.winston at gmail.com wrote:
> Hi All
> 
> I have a sed question: currently I am using sed to preprocess some garbage  
> collection log files produced by Java.
> There are 10 pieces on information on every line that I would like to  
> extract. I have just knocked up a large and ugly sed command to do this:
> 
> # Typical line
> # 7.181: [GC 7.181: [ParNew: 6193K->101K(6528K), 0.0031050 secs]  
> 8470K->2692K(64832K), 0.0031680 secs]
> 
> $ sed -n "/GC/{s/^\([0-9]\+\.[0-9]\+\): \[GC \([0-9]\+\.[0-9]\+\): \[ParNew
> : \([0-9]\+\)K->\([0-9]\+\)K(\([0-9]\+\)K), \([0-9]\+\.[0-9]\+\) secs\]  
> \([0-9]\+\)K->\([0-9]\+\)K(
> \([0-9]\+\)K), \([0-9]\+\.[0-9]\+\) secs\]/\1,\2,\3,\4,\5,\6,\7,\8,\9/gp}"  
> logfile
> 
> This has a fatal flaw, in that I have exhausted the maximum number of  
> backreferences available. Does anyone know a better way to do this?
> 
> Thanks
> Rory
> -- 
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