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raspberry pi のwifiを無効化する方法

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#無効化する理由
wifi使わない(有線やCandy pi liteを使うとき)
無駄に電流が流れる(0.02Aくらい)

##Wifi無効化
以下のコマンドを実行して、ラズパイを再起動すればwifiを無効化できます
sudo iwconfig wlan0 txpower off

##Wifi有効化
再び有効化したいときは以下のコマンドを実行して再起動
sudo iwconfig wlan0 txpower auto

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