grep

    Find all the IP addresses that have no reverse DNS.

    cat /var/log/exim/mainlog | grep reverse | awk ‘{print $13}’ | grep ‘^[0-9]\{ 1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}$’ | unique

    Find all viruses

    cat /var/log/exim/mainlog | grep virus | awk ‘{print $17}’ | grep -v virus

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