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# rename file
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require 'tempfile'
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max = 100_000
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tmp = [ Tempfile.new('rename-a'), Tempfile.new('rename-b') ]
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a, b = tmp.map { |x| x.path }
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tmp.each { |t| t.close } # Windows can't rename files without closing them
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max.times do
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File.rename(a, b)
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File.rename(b, a)
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end
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