Andatool displays in realtime how often one or more regular expressions match with what scrolls-by in a logfile. That way you can see quickly, for example, what firewall-rules get triggered most.
0.8 removed debugging code 0.7 previous versions would use 100% cpu 0.5 one can now also list the matching patterns 0.2 now handles terminal resize correctly 0.1 initial release
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MultiTail can also display this information while merging other data, filtering and much more.