How to make a command entry through the console?

Don't use commands if possible, they can only be executed if the user has permission to do so, this is Minecraft mechanic so server hacking is not possible.

Hummmmmmmmm… If commands procedure block don't work on servers, If we use a Key Binding which his procedure to change gamemode procedure block, So key binding work to change player's gamemode without command without permissions? Haven't test

Also I want an Item to strike lightning on ALL mobs in the world but it's not possible with a command

/execute @e ~ ~ ~ summon lightning_bolt

Is there another way to do this without this command?

Key bindings are client-side only, so the change most likely won't work. Even if it does, the server will refuse player from doing any creative mode work in case if the player was survival before.

I wrote about this in the past topics already, this is why client-side triggers can't do much as it could introduce issues with servers and security. One needs to implement custom packages to resolve this.

Ok, also I mean It's not possible WITHOUT a command

I want to create a client mod to simulate user sending messages

But I didn't find any way to do it.

Here are my thoughts：

First, press the X key to display the GUI，There is a button on the GUI。

Second, when I press the button, I send a message to everyone.

It's like sending messages in my normal chat.

Make it display   <player> testmessage   in chat boxes.

I've finished the GUI part.

But I couldn't find any commands to send messages.

please help me,thank you.

Client mods to play on server, i think ir's not possible using MCreator, i could be wrong