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janfri/file_changelines.rb

Created April 12, 2016 19:33
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file_changelines.rb
require 'fileutils'
require 'tempfile'
def File.changelines filename, &blk
temp = Tempfile.new('changelines')
File.foreach(filename) do |line|
line = blk.call(line)
temp.write(line)
end
temp.close
FileUtils.mv temp.path, filename
end
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