You should use HTML tags to format your post. It's very difficult to tell what you are asking the way you posted it!

I'm assuming you meant this:

Hi , I have a file which have input as like below 

pet="cat"|hate="rat"|like="dog"
hate="rat"|like="dog"|pet="cat"
hate="rat"|like="horse"|pet="cat"
pet="cow"|hate="rat"|like="dog"
hate="rat"|like="dog"|pet="cow" 

And output im looking is 

pet="cat"|hate="rat"|like="dog" 
pet="cow"|hate="rat"|like="dog" 

Any first instance where I find unique value for pet and hate I wanted
+ to print. Thanks
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You should have tried your hand at writing a solution and posted the code, but since I'm feeling generous here is a solution which you can pipe your input file to:

#! /usr/bin/env perl

use strict;
use warnings;

my %pet_hate;

while (<>) {
    my ($pet)  = /pet="(\w+)"/  or next;
    my ($hate) = /hate="(\w+)"/ or next;
    my ($like) = /like="(\w+)"/ or next;

    $pet_hate{"$pet:$hate"} //= {
        pet  => $pet,
        hate => $hate,
        like => $like,
    };
}

foreach (values %pet_hate) {
    printf(qq{pet="%s"|hate="%s"|like="%s"\n},
       $_->{pet},
       $_->{hate},
       $_->{like});
}
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Best,

Jim