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TEST_1,10.56.7.80
TEST_3,10.66.78.10
TEST_4,10.66.81.9
TEST_2,10.67.9.12

01,TEST_1,10.56.7.80
02,TEST_3,10.66.251.9
03,TEST_5,10.66.81.9

 use strict;
 use warnings;
...
        say "Match found $name, $first{$name}";
    } else {
        say "UPDATE need be done for $second{$name}";

  open ( my $input_1, '<', 'output1.csv' ) or die $!;
...
}
}

UPDATE need be done for 10.66.251.9
404 Not Found
...
404 Not Found
404 Not Found
Match found TEST_1,10.56.7.80

UPDATE need be done for 10.66.251.9
UPDATE need be done for 10.66.81.9
...

Match found TEST_1,10.56.7.80
Devices should be added: Test2