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length = ARGV.last ? ARGV.last.to_i : 140
chars = %w{< > + - . , [ ] [-] ,[.,] >,[.>,] [->+<] >[-]<[->+<]}
puts Array.new(length) {chars[rand(chars.length)]}.join[0, length]

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# generate_bf.rb
# (copyleft) Matt Gauger 2008
# Randomly generates a brainfuck program
...

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length = 140
program = ""
...

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#!/bin/sh

...