A system's logfiles not only record failed login attempts by users, but they also log program errors and information about attacks. Admins therefore should keep a continuous eye on them. Tools such as LOGalyze [1], Logcheck [2], Logwatch [3], MultiTail [4], and SwatchDog [5] can help you here.
REF: http://www.linux-magazine.com/Issues/2017/200/Five-lean-tools-for-monitoring-logfiles
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