Minecraft wiki entry for datapack, associated text: datapack disable <name>
datapack enable <name>
Enable the specified pack.
datapack enable <name> (first|last)
Load this pack before (lowest priority) or after (highest priority) all others (lowest or highest priority).
datapack enable <name> (before|after) <existing>
Load this pack just before (lower priority) or after (higher priority) an existing pack.
datapack list [available|enabled]
List all data packs, or list only the available/enabled ones. Hovering over the data packs in the chat output shows their description defined in their pack.mcmeta.