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cygwinで処理したデータをPowerShellへ渡すときはShift-JISがよさげです

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時代の流れに従って、cygwinでもUTF-8が使えますので、デフォルトをUTF-8にしています。
ところが、Windows10でPowerShellを使ってみるとUTF-8は特殊設定が必要なようです。
ポーティングやリプレースを考えると、デフォルトからの設定変更は少ない方が良いです。

#まとめ
PowerShellからCygwin(bash)を呼び出したときは、ja_JP.SJISにする。
そのために、~/.bashrc末尾に以下を追記

~/.bashrc
# PowerShellから呼び出し時だけShift-JISにする
if [ $PPID -eq 1 ]
then
        export LANG=ja_JP.SJIS
fi
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