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File.readlines('a.csv').each do |l| puts l unless l =~ /^\s*$/ end output: <snip 1000 rows> 825,2007-12-22,2007-12-28 825,2008-05-24,2008-05-30 852,2007-11-10,2008-02-29 863,2007-11-10,2008-03-31 881,2007-11-10,2008-03-04 889,2007-11-10,2008-03-14 890,2007-11- $ ruby -pe 'next if $_ =~ /^\s*$/' < a.csv output: <snip 1000 rows> 825,2007-12-22,2007-12-28 825,2008-05-24,2008-05-30 852,2007-11-10,2008-02-29 863,2007-11-10,2008-03-31 881,2007-11-10,2008-03-04 889,2007-11-10,2008-03-14 890,2007-11-10,2008-03-14 890,2008-04-26,2008-05-02 <end of file>

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