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あと何日でXXX(linux dateコマンド) ref: http://qiita.com/jamejammy/items/a7643b3a60a2facf3250
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| $ echo クリスマスまであと$(echo "`date -d$'12/25' +%j`-`date +%j`" |bc | tr -d '\n')日 |
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