You can create a package with package global variables in it, and get at those variables using their fully-qualified name, like this:
First, just name this one MyConfig.pm:
package MyConfig;
use strict;
use warnings;
our $testvar = "Hello world.";
1;
And now in MyScript.pl:
#!/usr/bin/perl
use strict;
use warnings;
use MyConfig;
print $MyConfig::testvar, "\n";
Using the fully qualified variable name means you won't be exporting it directly into your main script's namespace, you'll just be accessing the configuration package's namespace. That's a pretty easy way to do it.
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