http://www.perlmonks.org?node_id=896524


in reply to reading default configuration parameters from file and overriding these parameter values on command line

Old school
AppConfig
New school
File::UserConfig + Config::Any +
Data::Validator
Data::FormValidator
Params::Validate
Config::Validate
MooseX::Params::Validate
Data::Constraint
Validator::Custom
MojoX::Validator
FormValidator::Simple
Data::Validation
...