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問題 21 に別解を追加しました
ls -F を使ってディレクトリを判別してみました。
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answer/21.md

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@@ -7,3 +7,12 @@ $ find -type f | grep -v "\./dir_b/d" | sort
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$ shopt -s globstar
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$ echo dir_a/* dir_b/* dir_c/** | grep -o "[^ ]*[0-9]"
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```
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### 読者別解
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by [kariya-mitsuru](https://github.com/kariya-mitsuru)
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```
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$ shopt -s globstar
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$ ls -dF dir_[ab]/* dir_c/** | grep -v /$
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```

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