use warnings;
use strict;

use IO::Uncompress::Unzip qw(:all);

my $file1 = "all.zip";
my $file2 = "1.zip";

my $first = new IO::Uncompress::Unzip $file1
    or die "Cannot open $file1: $UnzipError\n";

my $output;
unzip $first => \$output
    or die "Cannot open $file2: $UnzipError\n";