print 'password: '
system "stty -echo"
password = $stdin.gets.chop
system "stty echo"
※2/2 追記
すでに既出のTipsであり、もっと適切な方法が以下に紹介されておりますので、そちらを参照して頂くことをオススメします！
http://qiita.com/items/88194612bb0fa705e39d
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