From: Hans Mackowiak <lists@...>
Date: 2013-02-04T16:53:54+09:00
Subject: Re: Class for data analysis: File.open once

for bigger files, this code may be better

lines, empty_lines = 0,0
File.foreach('file.dat') {|l| lines += 1; empty_lines += 1 if l =~ 
/^\s*$/}

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