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die("Usage: $0 [-c] [-v] <-f pattern-file | subnet/netmask> file [file
+...]\n")  unless ( (defined $#ARGV && $#ARGV > -1) || (defined $opt_f
+) ) ;
...
if ( defined $#ARGV && $#ARGV > -1) {

die "Usage: $0 [-c] [-v] <-f pattern-file | subnet/netmask> file [file
+...]\n" unless @ARGV || defined $opt_f;
...
if ( @ARGV ) {

            # remove non-ip-address characters, trim, break into words
+ to validate
            $IP_LINE =~ s/[^0-9.]+/ /g ;
            $IP_LINE =~ s/^ // ;
            $IP_LINE =~ s/ $// ;
            my @WORDS = split(/\s+/,$IP_LINE) ;

            # remove non-ip-address characters, trim, break into words
+ to validate
            $IP_LINE =~ tr/0-9./ /c;
            my @WORDS = split ' ', $IP_LINE;

    # grep each file
    for my $FNAME (@ARGV) {
...
        }

        open ($INFILE, "<$FNAME") ;

    # grep each file
    for my $FNAME (@ARGV) {
...
            warn "Cannot open '$FNAME' because: $!";
            next;
        };