nroff and groff are typesetting systems on Unix systems.

With the following two commands you can create a printable file and send it to your printer:

Karls-Mac-mini:~ karl$ groff -mm ch01 > ch01.fmt

Karls-Mac-mini:~ karl$ lp ch01.fmt
[download]

Update:...ch01 is formated file...

The very basic blueprint to include code in your perl program(s) is:

Update: Foo.pm

  package Foo;
  use strict;
  use warnings
  our $VERSION = '1.00';
  use base 'Exporter';
  our @EXPORT = qw( foo );
 
  sub foo {
     return "bar\n";
  }
 1;

# later, in your main program you say:
use strict;
use warnings
use lib q(/path/to/Foo);
use Foo;

print foo();
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See perlmod

pp for creating executables is OK (and cool) but keep in mind that this just are self extracting archives - you can unzip them.

Regards, Karl