> For the complete documentation index, see [llms.txt](https://doc.duaer.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.duaer.com/build/execute-command.md).

# Run a host command with Execute Command in Duaer

In Duaer, Execute Command runs a shell command on the machine that hosts Duaer. Execute Once is on by default. Command is required.
## Run echo once

1. Search for Execute Command and connect it after the previous node.
2. Leave Execute Once on so the command runs once for the batch.
3. Set Command, for example echo "test".
4. Select Execute step. The output includes exitCode, stdout, and stderr.

When Execute Once is off, the command runs once per input item.

Cloud or project policy may mark this node restricted. Refer to [Find a restricted node in Duaer and replace it](/hosting/security/restricted-nodes.md).
## Questions

### Does Execute Command on hosted Duaer control my laptop?

No. The command runs on the host that runs Duaer, not on your local machine.