#!/usr/bin/perl
use strict;
use warnings;
use Data::Validate::IP qw(is_ipv4);


print "Enter the absolute directory location for ifcfg files\n";
my $directory = <>;
chomp($directory);

opendir(DIR, $directory) or die "couldn't open $directory: $!\n";
my @ifcfg_files = grep { /^ifcfg-bond/ } readdir(DIR);
closedir DIR;


foreach (@ifcfg_files) {

my %hash = ();
my $file = "$_";

open (my $fh, "<", $file) or die "Can't open the file $file: ";


while (my $line =<$fh>)
{
    next if $. < 2;
    my($key, $parameter_value) = split("=", $line);
    next if $key eq "BONDING_OPTS";
    if (is_ipv4($parameter_value))
    {
      print $parameter_value;
    }
    else{
      print "Fail"
    }
}

} #Outer Foreach

Contents of ifcfg file

# Creating bond1
DEVICE=bond1
IPADDR=172.31.1.1
NETMASK=255.0.0.0
DNS1=172.30.12.25
MTU=
BOOTPROTO=none
ONBOOT=yes
USERCTL=NO
NM_CONTROLLED=no
BONDING_OPTS='mode=1 miimon=100'

Result

[root@localhost bond]# perl ifcfgbondverification.pl 
Enter the absolute directory location for ifcfg files
/root/office/ifcfgverification/bond
FailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFailFail[root@localhost bond]#