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For the term "fail2ban".

Netfilter (iptables) Tips & Tricks

Netfilter (aka iptables) is how you stop any intrusions. As an example, PSAD can recognize attack patterns, but it is Netfilter that is then used to stop any communcations from getting a response. In otherwords, Netfilter can be told to ignore incoming requests; essentially making the server unreachable.

GREP SED AWK VI and FIND Usage Notes for Webmasters

When it comes to manipulating files, you can do almost anything with GREP SED AWK VI and FIND (and I’m a novice). My notes (taken from far more capable individuals online than I. Thank you all for the education.) File manipulation using AWK, GREP, SED, FIND, VI AWK AWK to extract IPs from logs Lists of IPs from log file...