You can't craft it, it can only be obtained through the /give command.
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You are unable to craft command blocks in minecraft, but if you have cheats enabled on your singleplayer world, you may type /give {player} minecraft:command_block
Do /give @p minecraft:command_block 64
The only way to get a command block in Minecraft is to have cheats on in your world.Once you generated a world like that, type in the following command:/give [your Minecraft character's name] 137 [amount up to 64]That will give you a command block.
Yes, you can craft diamonds in Minecraft. To do this, simply place a diamond block on a crafting grid. This will yield nine diamonds. Similarly, you can place nine diamonds on the crafting table, which yields a diamond block. Other than this, there is no other way you can craft diamonds.Note: Diamond blocks are not naturally found in a Minecraft world.Consequently, you need to find diamonds to craft the diamond block to craftthe diamonds.
Command blocks currently can not be crafted. In creative mode the command /give YOURPLAYERNAME 137 1 will give you 1 command block (all you need in creative).