How can I obtain a command block without using any minecraft plugins? I want to do this on a vanilla server and I'm not too sure how.
Command blocks are easily obtainable through vanilla minecraft. Open your chat box and type
/give @p minecraft:command_block
This is a command which gives you a block, which in this case is a command block. You can give other players command blocks by replacing
@p with their username.
Cheats must be enabled for this to work, so go to settings and "open to lan" if necessary.