Consider the following hash structure:

$VAR1 = {

          '15746' => {
                       'ppid' => '15741',
                       'name' => 'echo Hello World'
                     },
          '15747' => {
                       'ppid' => '15741',
                       'name' => './bye.pl'
                     },
          '15741' => {
                       'ppid' => 'NA',
                       'name' => './hello_world.pl'
                     },
          '15748' => {
                       'ppid' => '15747',
                       'name' => 'echo Bye World'
                     }

        };
[download]

Also consider the following structure of a paths:

$VAR1 = {
          'data' => {
                      './strict.pm' => {
                                          'pid' => {
                                                     '15747' => 1,
                                                     '15741' => 1
                                                   }
                                        },
                      './hello_world.pl' => {
                                          'pid' => {
                                                     '15741' => 2
                                                   }
                                        },
                      './bye.pl' => {
                                         'pid' => {
                                                    '15747' => 2
                                                  }
                                       },
                      './bin-perl' => {
                                        'pid' => {
                                                   '15747' => 1,
                                                   '15741' => 1
                                                 }
                                      }

                    },
          'total' => {
                       './strict.pm' => 6,
                       './hello_world.pl' => 4,
                       './bye.pl' => 4,
                       './bin-perl' => 2
                     }
        };
[download]

In the previous thread I asked your help to create a chain file for each path. The final code looks as following:

sub parents
{
    my ($name,$pid,$processes_href) = @_;
    unless(exists($processes_href->{$pid})) {
        return '';
    }
    my $secondname = $processes_href->{$pid}{name};
    if ($name eq $secondname) {
        return parents($secondname,$processes_href->{$pid}{ppid},$proc
+esses_href);
    }
    return ",".$secondname.parents($secondname,$processes_href->{$pid}
+{ppid},$processes_href);
}

sub create_chain
{
    my ($processes_href,$paths_href) = @_;
    foreach my $data (keys(%{$paths_href>{'data'}})) {
        while (my ($file, $procs) = each %{$data}) {
            foreach my $pid (keys(%{$procs->{'pid'}})) {
                print $fh $file.parents($file,$pid,$processes_href)."\
+n";
            }
        }
    }
    close($fh);
}
[download]

Output:

./strict.pm,./hello_world.pl
./strict.pm,./bye.pl,./hello_world.pl
./hello_world.pl
./bye.pl,./hello_world.pl
./bin-perl,./hello_world.pl
./bin-perl,./bye.pl,./hello_world.pl
[download]

It works good but the final format is not so readable. I would like to create a format that looks like the output of the Linux command 'tree' which gets a directory and returns the recursive tree.
It looks as following:

tree ./regexpu-core/

|-- LICENSE-MIT.txt
|-- README.md
|-- data
|   |-- character-class-escape-sets.js
|   `-- iu-mappings.json
|-- package.json
`-- rewrite-pattern.js
[download]

For the example I gave, the output should be:

`-- hello_world.pl
    |-- bin-perl
    |-- bye.pl
    |   |-- bin-perl
    |   `-- strict.pm
    `-- strict.pm
[download]

At first, I have tried to find a module which does something similar but without any success. Also I tried to find some Linux command which does it but also without any success.
Now I'm trying to build a function which loops through the files creates each line, but for some reason it does not work. I'm not sure how to keep the length.
What would be a good and efficient solution do solve it? I copied the data exactly as printed by the Dummper :)
Also sorry if I have grammar mistakes. English is my third language.
Thank you

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