YAML::PP::Schema::Env This schema extends YAML::PP with a !ENV tag which can be used to interpolate environment variables when loading YAML data or files. To install, use perl Makefile.PL make make test make install Or just use any of the both CPAN installer commands: cpan YAML::PP::Schema::Env cpanm YAML::PP::Schema::Env After installation, the following command may be used to read the documentation: perldoc YAML::PP::Schema::Env The repository can be found at https://github.com/eserte/yaml-pp-schema-env