Minecraft wiki entry for Command_Block, associated text: 1 Obtaining
2 Usage
2.1 Modification
2.2 Activation
2.3 Execution
2.3.1 Trigger and chaining
2.4 Output
2.4.1 Success count
2.4.2 Message
2.5 Notes
2.5.1 Easter eggs
2.6 Piston interactivity
3 Sounds
4 Data values
4.1 ID
4.2 Block states
4.3 Block data
5 History
6 Gallery
7 Issues
8 References