a use pattern for nmap --- filtering for live hosts

[Bennett Todd <bet () rahul net>]

Suppose you've got a source command that generates a list of hosts
you should be interested in --- for some moderately expensive scan,
and with some depressing percentage of dead hosts in the mix.
Between the generator and the scanner, you can

  nmap -sP -iL - | awk '/appears to be up/{print $2}'

for a fast filter to sort out the deadwood.

-Bennett

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