$ grep -Rl "^bridge-ips [a-z]" bridge-descriptors-* | \
  xargs -I {} grep -E "^extra-info|^bridge" {} > bridge-stats

$ javac DetectBridgeBlockings.java && java DetectBridgeBlockings

$ R --slave -f bridge-blockings.R

The report sources are in tech-reports.git/2011/bridge-blockings/.

