TellMe

Description

TellMe is an informational mod for Minecraft. It is primarily meant for mod pack makers, mod developers or other users who need some technical information about the game, such as various game registry dumps.
It has various commands for dumping registries, for listing loaded entities/block entities/chunks/dimensions, for counting blocks or biomes in a given area etc.

Note: All the dump files go in the .minecraft/config/tellme/ directory and have the current timestamp in the filename.

Tip about the dump command: you can use the type all to run all the dump types at once, without having to type each one in manually.

Available commands

In the 1.14.4 and later versions, the available "top level" commands are:

• batch-run - runs commands from text files inside the config/tellme/batch_commands/ directory
• biome - prints a bunch of information of the current biome to chat
• biome-locate - samples biomes on a grid and outputs the closest location of each unique biome
• biome-stats - counts the biomes in a given area
• block-stats - counts the blocks in a given area
• dump - can dump all the game registries and a few other types of information
• dump-json - a specialized version of dump, only for blocks and items, to output the data in JSON format
• holding - prints information and the NBT data (if any) from the item in the player's hand
• loaded - list loaded chunks, dimensions, entities or tile entities in a given area or in all loaded chunks
• locate - searches for blocks, entities or tile entities by name from a given area or all loaded chunks
• locate-biome - searches for biomes in a given radius by sampling at a given grid interval
• looking-at - prints some basic information and the NBT data from the block (and tile entity) or entity the player is looking at

Command arguments/usage

In the 1.14 and later versions, I would recommend just using the command suggestions and completions to see the usage of each command.
For this to work, you should have the mod on both sides. If the mod is on the server side, it's not required on the clients, but the command suggestions for most arguments won't work without the mod on the client.

"Sidedness"

Currently in 1.14.4+ the mod only works when it's present on the logical server side, so either in single player, or when the mod is on the dedicated server. In other words there are no client-side commands anymore (for now at least) like there were in 1.12.2. (But of course using the client-side commands on a server wouldn't work properly for most things that list or locate something from the world anyway.) In addition to this, the mod should be on the clients that want to use the commands for the command suggestions/completions to work (like mentioned above).