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shell: lsの結果をforで処理する

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lsの結果をforで処理する方法。
grepで特定の拡張子に限定してから処理することも可能。

例)指定のディレクトリ内のすべてのtxtファイルの行数を表示する

for txt in $( ls . | grep .txt$ ); do   
    echo ${txt}  `cat $txt | wc -l`
done
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