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安全なcrontabの設定管理

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crontabのオプションは隣にあるeとrで意味が逆になる(edit/remove)のでcrontabコマンドを実行するのは怖いけれど,crontabの引数にファイル名を渡すと,そのファイルから読んで設定してくれる.

crontab -l > ~/crontab # 今の内容を出力
edit ~/crontab # 設定変更
crontab ~/crontab # ファイルから読み込む.現在の設定は上書きされるので注意
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