How to set a command block with a command inside using the setblock command

Solution 1:

You will need to do two things:

  • Firstly, there are two other parts to the /setblock command that need to be present; the datavalue, and the method of handling the existing block, if any.
  • Secondly, the data tag at the end should just be {Command: "testfor @p[_=1]"}, without the TileEntityData bit.

Thus, the resulting command should be along the lines of

/setblock <x> <y> <z> command_block 0 replace {Command:"testfor @p[_=1]"}

As proof, here's a shot of me using that command:

Typing the command

And here's the result:

The resulting command block