minecraft-assets/assets/minecraft/models/block/template_command_block.json

{
    "parent": "block/cube_directional",
    "textures": {
        "particle": "#back",
        "down": "#side",
        "up": "#side",
        "north": "#front",
        "east": "#side",
        "south": "#back",
        "west": "#side"
    }
}