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パスワード等の標準入力を隠す

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コンソールスクリプトなどで、パスワードを隠しつつ入力させたい時があります。
そんな時、 Ruby 1.9.3 以降であれば、 IO#noecho が使えます。

require 'io/console'

password = STDIN.noecho(&:gets)

Ruby 1.9.3 以前であれば、 highline gem を利用するのが簡単です。

require 'highline/import'

password = ask("Enter password: ") { |q| q.echo = false }
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