Bukkit

First of all: The custom recipe included in KLH - 4 Iron Ingots and 5 pieces of Redstone Dust make a CommandBlock. The recipe can be turned off in config.yml by placing CommandBlockRecipeEnabled: false in its first line.

All options that come with /cmdblock rely on the permission kittyslilhelpers.cmdblock. By default, it is granted to OP. They will only work when the issuing user has "targeted" the CommandBlock to be changed.

Enough babble, here they are: /cmdblock or /cmdblock help will display a brief overview on available options and their usages

/cmdblock setname [Name] updates the CommandBlocks name to - well, whatever [Name] you specified. It may include spaces.

/cmdblock getname returns its name

/cmdblock setcmd [Command] sets its command to [Command]. The Commands' leading slash is optional.

/cmdblock break breaks the CommandBlock and drops it - with name and command preserved and set accordingly when placed again.

Again, some images to clarify things. This is what /cmdblock getname returns:

How to set a command:

And how it looks like after you broke it with /cmdblock break: