Creating a simple Perl module

create-simple-perl-module

Use a module. Check out perldoc perlmod and Exporter.

In file Foo.pm

        package Foo;
        use strict;
        use warnings;
        use Exporter;

        our @ISA= qw( Exporter );

        # these CAN be exported.
        our @EXPORT_OK = qw( export_me export_me_too );

        # these are exported by default.
        our @EXPORT = qw( export_me );

        sub export_me {
            # stuff
        }

        sub export_me_too {
            # stuff
        }

        1;
        
In your main program:

        use strict;
        use warnings;

        use Foo;  # import default list of items.

        export_me( 1 );

Or to get both functions:

        use strict;
        use warnings;

        use Foo qw( export_me export_me_too );  # import listed items

        export_me( 1 );
        export_me_too( 1 );
        
You can also import package variables, but the practice is strongly discouraged.