Re: [Trisquel-users] How can one capture the "Failed to resolve" output to console during an nMap scan ?

[amenex]

Here's a sample of one online Webalizer file (stripped of reams of frequency  
and byte data)
which is trivial to separate. Now imagine about half a million lines of such  
data in random
order.

I can strip out the hostnames by putting two identical target lists  
side-by-side in
OpenOffice calc, stripping the dots (.) out of one, then applying "text to  
columns" and
deleting all but the left-most five columns of the spreadsheet. Some  
non-complying IPv4's
are left behind with leading letters in (usually) the first octets' column  
which grep
might find easily. There will also be short hostnames that didn't have three  
dots, but grep
should get those, too. Once that's done, subtract the IPv4 list from the  
original list ...