Minecraft – How to equip an item to the main hand without opening the inventory

What you're looking for is the world seed. In simple terms, the seed is a number that tells the game how to generate the terrain.

You have 2 options to create a world with a particular seed:

1. Find the seed of the map you want to recreate (press F3 for debug information in-game, or use various tools to recover the seed). Create a new world, and enter this seed under "More World Options"
2. Select a world from the single-player menu and click "Re-Create" to automatically make a new world with the same seed.

Alternatively, you can use the CommandSigns plugin to achieve this.

This assumes that the dungeon can be reached with /warp Dungeon and standard players have no access to it via the commands; only signs.

Firstly, the ~ identifier allows you to place a limit on the sign, and the ^ identifier executes the command under the player's name, but with the '*' permission node.
Note that this does not give them full command permissions, only just for the sign's execution; command stated in the sign.

You can visit the BukkitDev Wiki page for more information.

Here's how you set it up.

1. Place a sign, you can color it, make it fancy - Do whatever you want.
   Just ensure it doesn't follow Essential's sign formatting.
2. Enter the following command in the chat: /cmds add ~3600
   This defines a sign, with a execution cooldown of 3,600 seconds (or 60 minutes).
   Except, your sign does nothing.
3. Right click (or punch) your sign that you want this to be applied to.
4. Enter the following command: /cmds edit and punch the sign that you created in Step 2.
5. Enter the following command: /cmds insert 2 /^warp Dungeon.
6. Punch/right-click the sign.
7. You're done.