A TNT cannon tutorial using one command block. Compatible with Java Edition 1.14/1.15/1.16. Dowload the commands below:
Text Document Commands
http://www.mediafire.com/file/tcn6jdma9k30mys/Cannon_Commands.txt/file
Multiple Commands In One Command Block
https://www.minecraftforum.net/forums/minecraft-java-edition/redstone-discussion-and/commands-command-blocks-and/2980388-1-14-1-15-multiple-commands-in-one-command-block
