I would change the following:

• use var qw(...) to the newer our $var, $var2,..;
• Add a package moduleA; in your module file.
• Either write $moduleA::readMode or use the Exporter package to export your mode variables to the main file

BTW: Are you sure that pop(@_) is what I want, e.g. the last element of the list? Normally you do shift @_. In both cases the @_ is not needed because it's taken automatically inside a sub.

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