如何在scala 2.11中执行BASH source命令？

import java.io._

object BashSourceExample {
  def main(args: Array[String]): Unit = {
    val command = Seq("bash", "-c", "source /path/to/script.sh && echo $VAR_NAME")

    val processBuilder = new ProcessBuilder(command: _*)
    processBuilder.redirectErrorStream(true)

    val process = processBuilder.start()

    val inputStream = process.getInputStream
    val reader = new BufferedReader(new InputStreamReader(inputStream))

    var line: String = null
    while ({ line = reader.readLine(); line != null }) {
      println(line)
    }

    val exitCode = process.waitFor()
    println(s"Exit code: $exitCode")
  }
}