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The handlertree.pl script filters handler tracking output to include only those events in the tree that produced the nominated handlers. For example, to filter the output to include only the events associated with handlers 123, 456, and their predecessors: cat output.txt | perl handlertree.pl 123 456 or: perl handlertree.pl 123 456 < output.txt This script may be combined with handerlive.pl and handlerviz.pl to produce a graph of the "live" asynchronous operation chains. For example: cat output.txt | perl handlertree.pl `perl handlerlive.pl output.txt` | perl handlerviz.pl | dot -Tsvg > output.svg