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【Mac】コメント行しか記載していない Shell script なのに実行すると command not found と出るケース

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概要

コメント行しか記載していない Shell script を

$ bash aaaaa.sh

とかで実行したら command not found と出た話

改行コードが悪い

Winから持ってきたバッチファイルをシェルスクリプトに改造してMacで動かそうとしたんだけど、WinとMacでは改行コードが違うので、Macに合わせて改行コードを変換せずにそのままファイルの中身を改造したからいけなかった。
改行コードを LF に変更しなおしたらまともに動いた。

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