# Streaming command output

To stream command output as it is being executed, pass the `onStdout`, `onStderr` callbacks to the `commands.run()` method in JavaScript
or the `on_stdout`, `on_stderr` callbacks to the `commands.run()` method in Python.

<CodeGroup>
```js
import { Sandbox } from '@e2b/code-interpreter'

const sandbox = await Sandbox.create()
const result = await sandbox.commands.run('echo hello; sleep 1; echo world', {
  onStdout: (data) => {
    console.log(data)
  },
  onStderr: (data) => {
    console.log(data)
  },
})
console.log(result)
```
```python
from e2b_code_interpreter import Sandbox

sandbox = Sandbox()

result = sandbox.commands.run('echo hello; sleep 1; echo world', on_stdout=lambda data: print(data), on_stderr=lambda data: print(data))
print(result)
```
</CodeGroup>
