I'll second that... calling my $results = `ipconfig /all`; would be more than sufficient. Obviously you could also write this to a file

#!/perl -w

use strict;

my $results = `ipconfig /all`;

open(IPINFO, ">C:/ipconfig.out");

print IPINFO $results;

close IPINFO;
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which does produce results formatted exactly the way you would see on the screen. In other words newlines and whitespaces are preserved when receiving output from a backticked command