Program: How to run operating system specific command and read its output?

Below example shows how to run operating specific command and read its output. ProcessBuilder class can helps you to run any commands.

package com.java2novice.processbuilder;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class MyOsCommandRun {

	public static void main(String a[]){
		
		InputStream is = null;
		ByteArrayOutputStream baos = null;
		ProcessBuilder pb = new ProcessBuilder("ls", "-l");
		try {
			Process prs = pb.start();
			is = prs.getInputStream();
			byte[] b = new byte[1024];
			int size = 0;
			baos = new ByteArrayOutputStream();
			while((size = is.read(b)) != -1){
				baos.write(b, 0, size);
			}
			System.out.println(new String(baos.toByteArray()));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally{
			try {
				if(is != null) is.close();
				if(baos != null) baos.close();
			} catch (Exception ex){}
		}
	}
}

total 0
drwxrwxrwx  4 root  846622648  136 Aug 25 17:14 bin
drwxrwxrwx  3 root  846622648  102 Jul  5 21:22 resources
drwxrwxrwx  3 root  846622648  102 Mar 26 21:57 src