From: Javier Valencia <jvalencia@...01.org>
Date: 2005-03-01T06:01:03+09:00
Subject: Re: catting files

Mark Probert wrote:

>Hi ..
>
>There is approximately an order of magnitude difference in the performance of 
>these two snippets.  Is there a faster way of doing the pure Ruby version?
>
>
>### use the system call 'cat'
>def sys_cat
>    of = "plato.txt.cat"
>    clean(of)
>    l = `cat Plato/*.txt > #{of}`
>end
>
>
>### open each file and copy it
>def rby_cat
>    of = "plato.txt.rby"
>    clean(of)
>    off = File.new(of, "w+")
>    Dir["Plato/*.txt"].each do |f|
>        text = IO.readlines(f)
>        off.puts text
>    end
>    off.close
>end
>
>                user     system      total        real
>sys_cat     0.000000   0.015625   0.117188 (  0.167577)
>rby_cat     0.937500   0.085938   1.023438 (  1.064247)
>
>
>Thanks,
>
>  
>

Try mine:

def rby_cat
    File.open("file.rby", "w+") do |file|
        Dir["*.txt"].each do |f|
            file.write(IO.readlines(f))
        end
    end
end