How to Use /Tesfor for Map Making Purposes (Minecraft)

Step-by-Step Guide

1. 1

   Step 1: Understand that the /testfor command

   If you don't know how to get a command block, all you need to do is type: "/give (Player) minecraft:command_block".
   
   You cannot find this block in the creative inventory.
2. 2

   Step 2: although able to be used by a player

   It gives you the syntax of the command.
   
   But as explained, it is meant to be used in a command block.
   
   If this is in a Adventure Map, you don't know who you will be testing for.
   
   So where you type player, you can use some fillers.
   
   These include: @p(Targets the nearest player), @a(Targets all players), @r(Targets random player), or @e(This targets all entities.
   
   This was added in the
   1.8 update.) The last part of the syntax is a data tag.
   
   This will be covered later. , This is to see if a player is online.
   
   However, it is easier to just press your tab button on your keyboard (in Multiplayer).
   
   However, you can have a comparator take an output from a command block, just like it can take from a chest.
   
   To do this, place a comparator with the input against the command block.
   
   It the command succeeds (finds the player), it will give a redstone signal. , One of the easiest is /tell, having it tell you something.
   
   You can you use /tellraw for a more aesthetic look, but this requires a JSON text, and that is a completely different subject, one that requires it's own tutorial.
   
   The first command block tests for a player, and the second one tells you that this player is online. , We will cover and explain two types, but the rest you will have to do some research to learn.
   
   In the command syntax, you would type: "/testfor (Player) (Data Tag)".
   
   Data tags are written in brackets({}).
   
   One Data Tag is the Selected Slot tag.
   
   To use this, type: "/testfor (Player) {SelectedSlot:(Slot #)}" The slots are listed starting at 0, so your first hotbar slot is actually slot
   0.
   
   Your second hotbar slot is slot 1, and so on. , The syntax for this one is tricky.
   
   Type "/testfor (Player) {Inventory:}" This only works for hotbar slots. , For example, type: "/testfor (Player) {SelectedItemSlot:0,Inventory:}".
3. 3

   Step 3: is meant to be used in command blocks.

4. 4

   Step 4: Type /testfor and hit enter.

5. 5

   Step 5: Make the most basic application.

6. 6

   Step 6: Use this to power a second command block

7. 7

   Step 7: this one running many commands.

8. 8

   Step 8: Use the data tag command.

9. 9

   Step 9: Use another data tag

10. 10

    Step 10: Inventory.

11. 11

    Step 11: Use multiple data tags at once

12. 12

    Step 12: just separate them with a coma.

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