My guess is that the OP wants to edit the values of an existing hash. Each value that is not unique should be made so by appending an integer.
use strict;
use warnings;
use Data::Dumper;
my %example = (
a => 'red',
b => 'blue',
c => 'red',
d => 'green',
e => 'red',
);
my %desired = (
a => 'red',
b => 'blue',
c => 'red1',
d => 'green',
e => 'red2',
);
my %seen;
while (my ($letter, $color) = each %example) {
if ($seen{$color}++) {
$example{$letter} = $color . $seen{$color};
next;
}
$example{$letter} = $color
}
print Dumper( \%desired, \%example );
UPDATE: Added example.
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