On the offchance that you mean Environment variables (I'm guessing by your reference to configuration files), it might be helpful to look at Env

NAME
    Env - perl module that imports environment variables as scalars or
+ arrays

SYNOPSIS
        use Env;
        use Env qw(PATH HOME TERM);
        use Env qw($SHELL @LD_LIBRARY_PATH);

DESCRIPTION
    Perl maintains environment variables in a special hash named %ENV.
+ For when this access method is inconvenient, the Perl module "Env" a
+llows environment variables to be treated as scalar or array variable
+s.
[download]