FCHECK is a very stable PERL script written to generate and comparatively monitor a UNIX system against its baseline for any file alterations and report them through syslog, console, or any log monitoring interface. Monitoring events can be done in as little as one minute intervals if a system's drive space is small enough, making it very difficult to circumvent. This is a freely-available open-source alternative to 'tripwire' that is time tested, and is easier to configure and use.
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