Plotting a histogram with Perl can be achieved using GD::Graph::histogram or via Chart::Gnuplot. I will demonstrate the latter since the former already has a demo.

use Chart::Gnuplot;

my @counts = (10,11,20,5,13,19);
my @labels = ('a'..'f');

my $dataSet = Chart::Gnuplot::DataSet->new(
    xdata => \@labels,
    ydata => \@counts,
    title => "Histogram",
    style => "histograms",
);
# Create chart object and specify the properties of the chart
my $chart = Chart::Gnuplot->new(
    title  => "Simple testing",
    xlabel => "My x-axis label",
    ylabel => "My y-axis label",
    # this dumbs an ASCII histogram to console
    #terminal => 'dumb',
    # this plots it as a PNG
    output => 'x.png',
    terminal => 'png',
);

# Plot the data set on the chart
$chart->plot2d($dataSet);
[download]

bw, bliako

I am getting this error "Can't locate Chart/Gnuplot.pm in @INC". I tried installing but I keep getting

Fetching with LWP:
  ftp://ftp.perl.org/pub/CPAN/authors/01mailrc.txt.gz
LWP failed with code[500] message[LWP::Protocol::MyFTP: connect: Conne
+ction timed out]
Fetching with Net::FTP:
  ftp://ftp.perl.org/pub/CPAN/authors/01mailrc.txt.gz

Trying with "/usr/intel/bin/wget -O -" to get
    ftp://ftp.perl.org/pub/CPAN/authors/01mailrc.txt.gz
--2021-10-26 23:53:56--  ftp://ftp.perl.org/pub/CPAN/authors/01mailrc.
+txt.gz
           => ‘-’
Resolving ftp.perl.org (ftp.perl.org)... 203.178.137.175
Connecting to ftp.perl.org (ftp.perl.org)|203.178.137.175|:21... faile
+d: Connection timed out.
Retrying.

--2021-10-26 23:56:09--  ftp://ftp.perl.org/pub/CPAN/authors/01mailrc.
+txt.gz
  (try: 2) => ‘-’
Connecting to ftp.perl.org (ftp.perl.org)|203.178.137.175|:21... faile
+d: Connection timed out.
Retrying.

--2021-10-26 23:58:21--  ftp://ftp.perl.org/pub/CPAN/authors/01mailrc.
+txt.gz
  (try: 3) => ‘-’
Connecting to ftp.perl.org (ftp.perl.org)|203.178.137.175|:21... faile
+d: Connection timed out.
Retrying.

--2021-10-27 00:00:35--  ftp://ftp.perl.org/pub/CPAN/authors/01mailrc.
+txt.gz
  (try: 4) => ‘-’
Connecting to ftp.perl.org (ftp.perl.org)|203.178.137.175|:21... faile
+d: Connection timed out.
Retrying.
[download]

I am sorry, I have no idea. It looks like you have some connection errors. For me, wget 'ftp://ftp.perl.org/pub/CPAN/authors/01mailrc.txt.gz' works fine.

Note: most likely you will also have to install the gnuplot package for your system. Either with the system package manager, for example dnf, apt-get, etc., if it's some Linux or download the source from https://sourceforge.net/projects/gnuplot/files/gnuplot/ and compile&install or download a binary dist from http://www.gnuplot.info/download.html