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データ容量が大きいログファイルをgrepする

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データ容量が多いとうまくgrepすると時間がかかるが、oオプションをつけると該当パターンの箇所のみを表示するので便利。

grep -o [検索内容] [ファイル名]

wc -lでパイプすると対象行数がカウント出来るのでさらに便利。

grep -o [検索内容] [ファイル名] | wc -l

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