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Get the host names of the machines connected via TCP in Bash
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| netstat | grep ESTABLISHED | sed -E 's/tcp[0-6]*\s+[0-9]+\s+[0-9]+\s+[a-z0-9]+(\.[0-9a-z]*)*:([0-9a-z]+)\s+//' | sed -E 's/(\.[a-z]*)*:[-a-z0-9]+\s+ESTABLISHED//' | sort | uniq -c |
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