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module Kernel
private def `(cmd) #`
IO.popen(cmd) { |io| io.read }
end
private def open(file, *rest, &block)
raise ArgumentError unless file.is_a?(String)
if file[0] == "|"
IO.popen(file[1..-1], *rest, &block)
else
File.open(file, *rest, &block)
end
end
private def print(...)
$stdout.print(...)
end
private def puts(...)
$stdout.puts(...)
end
private def printf(...)
$stdout.printf(...)
end
private def gets(...)
$stdin.gets(...)
end
private def readline(...)
$stdin.readline(...)
end
private def readlines(...)
$stdin.readlines(...)
end
end
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