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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;


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 = != -1){
				baos.write(b, 0, size);
			System.out.println(new String(baos.toByteArray()));
		} catch (IOException e) {
			// TODO Auto-generated catch block
		} 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
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List Of All ProcessBuilder Class Sample Programs:

  1. How to invoke other applicatons in java?
  2. How to run operating system specific command and read its output?
  3. How to get process environment variables in java at runtime?
  4. How to run ProcessBuilder with list of commands?
Knowledge Centre
Pass by value Vs Pass by reference
Pass by value: Passing a copy of the value, not the original reference.

Pass by reference: Passsing the address of the object, so that you can access the original object.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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