I would like to use the following Schwartzian transform sorting script (which is working perfectly as a standalone script), on a multiple files in the folder:

#!/usr/bin/perl
use strict;
use warnings;

open my $input, '<' or die "Unable to open input file: $!";
my @file = <$input>;
my @sorted_file = map { $_->[0] }
             sort { $a->[1] <=> $b->[1] }
             map { my ($x) = $_ =~ /VerNumber:\((\d+)/i; [$_, $x]; }
             @file;
open my $output, '>' or die "Unable to open output file: $!";
print $output $_ for @sorted_file;
[download]

The script should take as an input all the files in one folder starting with file*, and sort the content of each one:

file1.txt
file2.txt
...
file1000.txt
[download]

Then, as an output I would like for the script to create new folder in which it will place new files, with the sorted content, keeping the same file names.

/sorted
file1.txt -> /sorted/file1.txt
file2.txt -> /sorted/file2.txt
...
file1000.txt -> /sorted/file1000.txt
[download]

I have made the following script. It does write the files in the output folder, keeping the same file names, but the sorting part is not working and I am getting the same files in the output (even though the sorting script is working fine as a standalone one). Any help?

#!/usr/bin/perl
use strict;
use warnings;
use Getopt::Long;

my $version="0.2";
my $files_match="";
my $files_dir="";
my $file_name="";
my $help_flag="";
my $version_flag="";

GetOptions(
           'm|match=s' => \$files_match,
           'd|directory=s' => \$files_dir,
           'h|help' => \$help_flag, 'v|version' => \$version_flag,
);

sub sorting {
my @file = "$_";
my @sorted = map { $_->[0] }
             sort { $a->[1] <=> $b->[1] }
             map { my ($x) = $_ =~ /VerNumber:\((\d+)/i; [$_, $x]; }
             @file;
print FILE $_;
}

if (($files_match ne "") and ($files_dir ne "")) {
        chdir("$files_dir") or die "$!";
        opendir (DIR, ".") or die "$!";
        my @files = grep {/$files_match/} readdir DIR;
        my $files_size = $#files + 1;
        my $index_file = 1;
        print "Files to process: $files_size\n";
        close DIR;

        foreach (@files) {
                open(FILE, ">./sorted/$_.sort") or die $!;
                my @singlefile = $_;
                print "Processing $index_file of $files_size files: $_
+\n";
                local @ARGV = @singlefile;
                while(<>){
                       sorting($_);
                }    
                close(FILE);
                $index_file++;
                print "OK: Sorted @singlefile \n";
        }
    } elsif ((!$help_flag) and (!$version_flag)){printHelp();}
[download]

I am a beginner in Perl and any help would be more than welcome! Thank you in advance!

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