pidbefore.java

public static void main(String[] args) throws Exception {
    Process proc = Runtime.getRuntime().exec(new String[] {
      "/bin/sh",
       "-c",
       "echo $PPID"
    });

    if (proc.waitFor() == 0) {
      InputStream in = proc.getInputStream();
      int available = in.available();
      byte[] outputBytes = new byte[available];

      in.read(outputBytes);
      String pid = new String(outputBytes);

      System.out.println("Your pid is " + pid);
    }
}