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2つのテキストファイルの同じ要素を持つ行だけ抽出したい

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grep芸だけでできた。

あるテキストファイル a.txt と b.txt について、同じ要素の行だけ抽出したいなら以下の通りにすれば良い。

$ grep -x -f {a, b}.txt

個数(行数)を知りたいならば

$ grep -c -x -f {a, b}.txt

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