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Linuxサーバーへ不正ログインを試みたユーザー一覧を出すワンライナー

More than 5 years have passed since last update.

lastbコマンドを使えば、SSHのログイン失敗のログが参照できるので後は、awkでログイン失敗回数をカウントし、uniqコマンドでユーザー名を取り出して、sortコマンドでソートして、headコマンドでトップ10を出すというような感じ。

# lastb | awk '{print $1}' | sort | uniq -c | sort -nr | head -10

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