Problema com java.util.Scanner(InputStream).next();

import java.io.*;
import java.util.Scanner;

public class Main {
	public static void main(String... args) {
		String cmd = "ls /";
		ProcessBuilder pb = new ProcessBuilder("bash", "-c", cmd);
		pb.redirectErrorStream(true);
		try {
			Process p = pb.start();		
			InputStream input = p.getInputStream();

			ExecutaLeitura el = new ExecutaLeitura(input);

			int saidaDaLeitura = el.getRetornoExecutLeitura();
			switch(saidaDaLeitura) {
				case 0:
					System.out.println("Executado: "+ cmd);
					break;
				default:
					Scanner sc = new Scanner(input);
					// Captura a quebra de linha
					sc.useDelimiter("\r");
					String[] saida = sc.next().split("\n");
					for(String s: saida)
						System.out.print(s +"\n");
					break;
			}
			
			input.close();
		} catch (Exception e) {
			System.out.println("Problema com a classe comandos");
			e.printStackTrace();
		}
	}
}

import java.io.IOException;
import java.io.InputStream;
import java.io.Writer;

public class ExecutaLeitura implements Runnable {
	InputStream in;
	Writer out;
	int bytesLido;
	
	ExecutaLeitura(InputStream in) {
		this.in = in;
	}
	@Override
	public void run() {
        try {  
            int nextByte = in.read();  
            while (nextByte != -1) {  
                out.write(nextByte);  
                nextByte = in.read();
            }
            setRetornoExecutLeitura(nextByte);
        } catch (IOException e) {  
            e.printStackTrace();  
        } 		
	}
	private void setRetornoExecutLeitura(int byteLido) {
		this.bytesLido = byteLido;
	}
	public int getRetornoExecutLeitura() {
		return bytesLido;
	}
}