Here's another minimal example. It passes a module name and a string to a parent module that then handles everything. Please understand that I do not recommend this code as any kind of example of best practice or even as vaguely kosher. 

# MyTools.pm

package MyTools;

use warnings;
use strict;

sub import {

    my ($importing_package,
        $string_for_export,
        ) = @_;

    $string_for_export = '[default]' if ! defined $string_for_export;

    { no strict 'refs';  # turn off in narrowest scope
        # use a symbolic reference (gasp)
        ${ $importing_package . '::var' } = $string_for_export;
        }

    }

1;

[download]
# MyChest.pm

package MyChest;

use warnings;
use strict;

use parent qw(MyTools);

1;

[download]
# MyBag.pm

package MyBag;

use warnings;
use strict;

use parent qw(MyTools);

1;

[download]
# MyBox.pm

package MyBox;

use warnings;
use strict;

use parent qw(MyTools);

1;

[download]
Script set_in_importing_script_2.pl: 
use warnings;
use strict;

use MyChest 'Swiss Army knife';
use MyBox   '6-bladed screwdriver';
use MyBag;  # no string specified

print 'all variables printed from ', __PACKAGE__, ": \n";
print "    var in MyChest: '$MyChest::var' \n";
print "    var in MyBox: '$MyBox::var' \n";
print "    var in MyBag: '$MyBag::var' \n";

[download]
Output from set_in_importing_script_2.pl: 
c:\@Work\Perl\monks\TerryBerry>perl set_in_importing_script_2.pl
all variables printed from main:
    var in MyChest: 'Swiss Army knife'
    var in MyBox: '6-bladed screwdriver'
    var in MyBag: '[default]'

[download]

Update: Slight wording change in intro to improve clarity (I hope). No code change.

Give a man a fish:  <%-{-{-{-<

In reply to Re: Set a variable in calling package by AnomalousMonk
in thread Set a variable in calling package by TerryBerry

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