validate(feed) - phpMan

cache_check (8)      - validates cache metadata on a device or file.
CPAN::Meta::Validator (3pm) - validate CPAN distribution metadata structures
Data::Validate::IP (3pm) - IPv4 and IPv6 validation methods
era_check (8)        - validate era metadata on device or file.
era_invalidate (8)   - Provide a list of blocks that have changed since a par...
fc-validate (1)      - validate font files
git-verify-pack (1)  - Validate packed Git archive files
thin_check (8)       - validates thin provisioning metadata on a device or file