$ cat > pm_1075438_1.txt
qw<er ty>
a>sd <fgh

$ gzip pm_1075438_1.txt

$ cat > pm_1075438_2.txt
<zxc vbn>
123> <456

$ gzip pm_1075438_2.txt

##</code><code>##

#!/usr/bin/env perl

use strict;
use warnings;

my %h;
++$h{$_} for map { chomp; $_ } `zcat @{[glob '*.gz']} | sed 's/[<> ]//g'`;

use Data::Dump;
dd \%h;

##</code><code>##

{ 123456 => 1, asdfgh => 1, qwerty => 1, zxcvbn => 1 }

##</code><code>##

++$h{$_} for map { chomp; s/[<> ]//g; $_ } `zcat @{[glob '*.gz']}`;