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 very frequently if a system's drive space is small enough, making it more 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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