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OS-detection. Run this nmap command to count OS's and view the os.txt output file to see the results per-system.
$ sudo nmap -F -O [IP-RANGE] | grep "scan report\|Running: " > os.txt; echo "$(cat os.txt | grep Apple | wc -l) OS X devices"; echo "$(cat os.txt | grep Linux | wc -l) Linux devices"; echo "$(cat os.txt | grep Windows | wc -l) Windows devices"
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