Как провести проверку в строке?

#!/bin/bash


a="0000000000000000;39999999999;2;NONE;true;526;246;101;100;2;1;;;;;;8;101/100.000.99.99;246/000.000.122.122"

b=`echo $a | awk -F ";" '{print $7"-"$8}'`

c=`echo ${a} | awk -F ";" '{print $18}' | awk -F "/" '{print $1}'`

d=`echo ${a} | awk -F ";" '{print $19}' | awk -F "/" '{print $1}'`

if [[ "$b" == "$d"-"$c" ]]
then

echo $a | awk -F ";" '{print $1 ";" $2 ";" ";" $3 ";" $4 ";" $5 ";" $6 ";" ";" ";" ";" $9 ";" $10 ";" $11 ";" $12 ";" $13 ";" $14 ";" $15 ";" $16 ";" $17 ";" $18 ";" $19}'

fi

my $str = '0000000000000000;39999999999;2;NONE;true;526;246;101;100;2;1;;;;;;8;101/100.000.99.99;246/000.000.122.122';

 
#-------------------------------------------------------------------------------
#  Заменили дроби на ;
#-------------------------------------------------------------------------------
$str =~ s!/!;!gx;


#-------------------------------------------------------------------------------
#  Получили один большой массив
#-------------------------------------------------------------------------------

my (@arr) = split ';', $str;


#-------------------------------------------------------------------------------
#  Получаем дубликаты
#-------------------------------------------------------------------------------

my %seen = ();
my @dup = map { 1==$seen{$_}++ ? $_ : () } @arr;

say Dumper @dup;