There are tools like chef/puppet are there for configuration management. we can mention the resource and the tool will make sure whether it is present or absent.
This simplifies lot of things. But what i look for configuration validation. Chef and puppet either install or uninstall the configuration rather than just validate. Is there any tool which will say the configuration exists or not by validating it?
InSpec and Serverspec are, as mentioned, built explicitly for this. Chef's why-run and Puppet's dry-run modes can also help by showing what would be changed if they were run.