/usr/share/circos/tools/bundlelinks/run is in circos-tools 0.22-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/bash
cat data/dog.vs.human.all.txt | bin/bundlelinks > data/dog.vs.human.bundles.new.txt
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