Jena tips and tricks - oslc-op/oslc-specs GitHub Wiki
Combining multiple RDF files into one
riot -q --check --stop --formatted=turtle sh_test* > ../quality-management-shapes.ttl
Same but with a default base URI:
riot -q --check --stop --formatted=turtle --base='https://open-services.net/ns/qm/shapes/ps01#' sh_test* > ../quality-management-shapes.ttl