From: "baptiste Auguié" <ba208@...>
Date: 2007-07-02T00:27:28+09:00
Subject: Re: awk regexp search

Thanks everybody,


this piece of code works fine for me,


output_file.each { |line|
    case line
    when /scattering efficiency/
     qsca << line.split(/\s+/)[4]
    end
}

although I realize now that "output_file" may contain a duplicate of  
the line I want to extract. How can I specify to take only the last  
occurrence?

The file to parse looks something like that,

>  a few lines ...
>
>
>       scattering efficiency =    2.8009E-08
>       extinction efficiency =    4.9374E-06
>
> some lines in between ...
>
>
>       scattering efficiency =    2.7957E-08
>       extinction efficiency =    4.9374E-06
> ...



On 1 Jul 2007, at 15:51, Robert Dober wrote:

> On 7/1/07, dblack@wobblini.net <dblack@wobblini.net> wrote:
>> Hi --
>>
>> On Sun, 1 Jul 2007, baptiste Augui� wrote:
>>
>> > Hi,
>> >
>> > The last bit of a bash program is still resisting me. Here is  
>> the code I used
>> > before:
>> >
>> > awk '/scattering efficiency/{print $4}' ../OUTPUTFILES/Output.dat
>> >
>> >
>> > How would you do that in Ruby? I just need to locate this regexp  
>> in the file,
>> > and get the following value in the same line. I've tried  
>> something like,
>> >
>
>> $ ruby -ne 'puts $1 if /scattering efficiency\s+(\S+)/'
>> scattering efficiency blah
>> => blah
>> nothing
>> this has scattering efficiency just like the other one
>> => just
>>
> The problem is that we have no idea where "scattering efficency" is
> relatively to $4 :(
> However
>
> ruby -ane 'puts $F[3] if /scattering efficency/' ../ton/beau/fichier
>
> does the same as the awk script above
>

this piece of code needs to be part of a script, not a one line call - 
 > how would that work in a Ruby script?

> Side Remark:
> domage que l'on ne puisse utiliser mes options pr�f�r�es: -anpe ;)

; )


>
>
> Robert

Thanks,

baptiste