http://qiita.com/7of9/items/b9c90e27593fae16252b
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$ date --date="20161020 1 days ago" "+%Y%m%d"
20161019
More than 5 years have passed since last update.
GNU coreutils > date > 指定日の前日をyyyymmddで表示するワンライナー > $ date --date="20161020 1 days ago" "+%Y%m%d"
Last updated at Posted at 2017-01-17
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