Sec is a free and platform independent event correlation tool that was designed for network and application management, but it can be applied for solving any other task where similar event correlation operations are relevant. Since sec uses powerful regular expression concept for matching input and also supports named pipes as input files, it can not merely be used for matching events from a single logfile, but also for more general purposes. You can integrate sec with arbitrary network management (or other) application, provided that output from that application can be directed to a named pipe, which most modern network management platforms provide. Written in perl, works on Unix and Windows. FAQ here.
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