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shellでファイルが存在しない場合だけコピーを実行する書き方

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ポイントは[]の中に半角スペースを入れること。
たとえば以下の場合、カレントディレクトリに.envが存在しない場合、.env.exampleを.envにリネームしてコピーする。

if [ ! -e .env ]; then cp -n .env.example .env; fi
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