scanAlert is a utility that is designed to immediately alert an administrator of a port scan against Linux.
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LogDog is a very easy to configure and install system log monitor for watching system log files and emailing administrators when problems are found. Note that LogDog sends email to REAL email addresses, and does not require sendmail to be installed, it uses SendEmail which is also written by me and is included with the LogDog package as of v0.94.4. LogDog has a single configuration file which allows you to easily specify a list of key words to watch for, a list of words to ignore, a list of administrators to email when problems are found.
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