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Re: How to remove duplicate IPs

by jwkrahn (Monsignor)
on Aug 08, 2013 at 00:41 UTC ( #1048466=note: print w/ replies, xml ) Need Help??


in reply to How to remove duplicate IPs

open (NMAP_DATA, "@ARGV") or die "Please type the filename. $!" ;

That should probably be:

open (NMAP_DATA, $ARGV[0]) or die "Please type the filename. $!" ;

But would be even better as:

open NMAP_DATA, '<', $ARGV[0] or die "Cannot open '$ARGV[0]' because: +$!";


my @ip_address = sort $1, "\n" if /($RE{net}{IPv4})/; print IP_DATA @ip_address if (!/^\s*$/);

Why are you sorting the two values $1 and "\n"?    Why are you using an array when you only need a scalar?

print IP_DATA "$1\n" if /($RE{net}{IPv4})/;


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Re^2: How to remove duplicate IPs
by sinhass (Initiate) on Aug 08, 2013 at 03:15 UTC

    Hi jwkrahn , thanks for your advise. And frankly speaking I am learning perl so I have no clear idea yet.

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