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個人メモ: ランダムな何かを生成する Ruby ワンライナー

個人的に必要になるけど、よく忘れるのでメモ

13桁のランダムな数字 (ただし、先頭は常に 1)

ruby -e "puts('1' + (1..12).map { ('0'..'9').to_a.sample }.join)"

20 バイトのランダムなバイト列 (hexadecimal 形式)

ruby -r securerandom -e 'puts SecureRandom.hex(20)'
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Help us understand the problem. What are the problem?