Minecraft – How to change the username on an online-mode enabled server

minecraft-java-edition

I'm looking for a batch command which allows you to change name on an "online-mode=false" Minecraft server.

I have tried these commands and lots of others:

java -Xms512m -Xmx1024m -cp "%APPDATA%\.minecraft\bin\*" -Djava.library.path="%APPDATA%\.minecraft\bin\natives" net.minecraft.client.Minecraft '"'%1'"'

@SET /P IGN=IGN=
@java -Xms512m -Xmx512m -cp "%APPDATA%/.minecraft/bin/*" -Djava.library.path="%APPDATA%/.minecraft/bin/natives" net.minecraft.client.Minecraft %IGN%

I'm running Mincraft via this command for now:

javaw -Xmx2048m -Xms2048m -jar "C:\Users\Seras\AppData\Roaming\.minecraft\bin\minecraft.exe"

I have Windows 7 x64 with Java 7 (build 1.7.0_02-b13, should be a 64-bit version).

Edit: I'm running the latest minecraft unmodded.
Btw found this "Client version 1.2.2 does not accept the command line arguments that previous versions accepted." so if anyone can get a command that works on a Client version 1.2.2 or later please post your command line here.

Best Answer

I don't think you can change your username (unless hacking or spoofing is involved - and I won't cover those) on online-mode=true servers. The only way would be for the server you're connecting to to support commands (via mods) that are IRC-like which allow users to go by aliases.

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