First you need to update your minefraft to 1.3.1. If you have done that you need to go into settings and turn cheat/command mode oh
As of Mon 28 Nov 2011, there is not an updated Single Player Commands mod.
No, wait for an update.
no
you have to cyt
Single player commands are needed.
You get a mod, such a Single Player Commands.
well minecraft 1.2.3 single player is beta so there are no commands hopefully in the next version
you can install Single Player Commands and there is a freecam option.
do /clear inventory or just /clear
Use //set cobblestone.
In multiplayer, commands are generally started with a "/" Single player commands have not yet been added, unless you get a mod that has commands, like WorldEdit. They will be added in the next update, 1.3.
Try a mod. You could use InvEdit or SPC (Single Player Commands).
Have you installed ModLoader and/or deleted the META-INF folder in the minecraft.jar.
Yes, it's called Single Player Commands (SPC)