Task: Execute a command on the host machine

n8n workflow JSON:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"Execute Command","type":"n8n-nodes-base.executeCommand","position":[450,300],"parameters":{"command":"echo \"n8n rocks!\""},"typeVersion":1}],"connections":{"On clicking 'execute'":{"main":[[{"node":"Execute Command","type":"main","index":0}]]}}}