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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. 
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)
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