Solved

unix in java example

Posted on 2016-10-21

Java
Unix OS

2 solutions

Medium Priority

111 Views

Last Modified: 2016-10-28

Hi,

I am running below exam in eclipse

https://www.mkyong.com/java/how-to-execute-shell-command-from-java/

getting below errrors.

Bad option -c.

Usage: ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS]
[-r count] [-s count] [[-j host-list] | [-k host-list]]
[-w timeout] [-R] [-S srcaddr] [-4] [-6] target_name

Options:
-t Ping the specified host until stopped.
To see statistics and continue - type Control-Break;
To stop - type Control-C.
-a Resolve addresses to hostnames.
-n count Number of echo requests to send.
-l size Send buffer size.
-f Set Don't Fragment flag in packet (IPv4-only).
-i TTL Time To Live.
-v TOS Type Of Service (IPv4-only. This setting has been deprecated
and has no effect on the type of service field in the IP Header).
-r count Record route for count hops (IPv4-only).
-s count Timestamp for count hops (IPv4-only).
-j host-list Loose source route along host-list (IPv4-only).
-k host-list Strict source route along host-list (IPv4-only).
-w timeout Timeout in milliseconds to wait for each reply.
-R Use routing header to test reverse route also (IPv6-only).
-S srcaddr Source address to use.
-4 Force using IPv4.
-6 Force using IPv6.

package sample;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class ExecuteShellComand {

	public static void main(String[] args) {

		ExecuteShellComand obj = new ExecuteShellComand();

		String domainName = "google.com";

		//in mac oxs
		String command = "ping -c 3 " + domainName;

		//in windows
		//String command = "ping -n 3 " + domainName;

		String output = obj.executeCommand(command);

		System.out.println(output);

	}

	private String executeCommand(String command) {

		StringBuffer output = new StringBuffer();

		Process p;
		try {
			p = Runtime.getRuntime().exec(command);
			p.waitFor();
			BufferedReader reader =
                            new BufferedReader(new InputStreamReader(p.getInputStream()));

                        String line = "";
			while ((line = reader.readLine())!= null) {
				output.append(line + "\n");
			}

		} catch (Exception e) {
			e.printStackTrace();
		}

		return output.toString();

	}

}

Open in new window

please advise

Comment

Question by:gudii9

[X]

Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

Help others & share knowledge
Earn cash & points
Learn & ask questions

Join The Community

9 Comments

LVL 7

Assisted Solution

by:Thomas Wheeler

Thomas Wheeler earned 1000 total points

ID: 418543972016-10-21

it's saying that the ping utility that is being called uses -n not -c for the count

LVL 38

Accepted Solution

by:Gerwin Jansen, EE MVE

Gerwin Jansen, EE MVE earned 1000 total points

ID: 418544272016-10-21

You are running this program under Windows, not Unix/Linux. The output you see is from the Windows ping command.

Change like this:

            //in mac oxs
            // String command = "ping -c 3 " + domainName;

            //in windows
            String command = "ping -n 3 " + domainName;

            String output = obj.executeCommand(command);

LVL 7

Author Comment

by:gudii9

ID: 418545302016-10-21

package sample;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class ExecuteShellComand {

	public static void main(String[] args) {

		ExecuteShellComand obj = new ExecuteShellComand();

		String domainName = "google.com";

		//in mac oxs
		//String command = "ping -c 3 " + domainName;

		//in windows
		//String command = "ping -n 3 " + domainName;

		//String output = obj.executeCommand(command);
		 String command = "ping -n 3 " + domainName;

         String output = obj.executeCommand(command);
		System.out.println(output);

	}

	private String executeCommand(String command) {

		StringBuffer output = new StringBuffer();

		Process p;
		try {
			p = Runtime.getRuntime().exec(command);
			p.waitFor();
			BufferedReader reader =
                            new BufferedReader(new InputStreamReader(p.getInputStream()));

                        String line = "";
			while ((line = reader.readLine())!= null) {
				output.append(line + "\n");
			}

		} catch (Exception e) {
			e.printStackTrace();
		}

		return output.toString();

	}

}

Open in new window

above gave below output
Pinging google.com [64.233.177.102] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 64.233.177.102:
Packets: Sent = 3, Received = 0, Lost = 3 (100% loss),

not sure why timing out. is it due to firewall?

LVL 7

Author Comment

by:gudii9

ID: 418545312016-10-21

package sample;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class ExecuteShellComand {

	public static void main(String[] args) {

		ExecuteShellComand obj = new ExecuteShellComand();

		String domainName = "google.com";

		//in mac oxs
		//String command = "ping -c 3 " + domainName;

		//in windows
		//String command = "ping -n 3 " + domainName;

		//String output = obj.executeCommand(command);
		 String command = "ping -n 3 " + domainName;

         String output = obj.executeCommand(command);
		System.out.println(output);

	}

	private String executeCommand(String command) {

		StringBuffer output = new StringBuffer();

		Process p;
		try {
			p = Runtime.getRuntime().exec(command);
			p.waitFor();
			BufferedReader reader =
                            new BufferedReader(new InputStreamReader(p.getInputStream()));

                        String line = "";
			while ((line = reader.readLine())!= null) {
				output.append(line + "\n");
			}

		} catch (Exception e) {
			e.printStackTrace();
		}

		return output.toString();

	}

}

Open in new window

LVL 38

Expert Comment

by:Gerwin Jansen, EE MVE

ID: 418545622016-10-21

Try another site to ping.

But from your other question: you cannot download from a Cygwin mirror, you have similar issues here -> fix your internet setup first...

LVL 38

Expert Comment

by:Gerwin Jansen, EE MVE

ID: 418545652016-10-21

So your program in Eclipse is working, your internet connection issue is not what we can solve here for you.

LVL 7

Author Comment

by:gudii9

ID: 418574392016-10-24

when i used second radio button optiuon which says like 'internet proxy' that worked. Then it gave lot of urls and selected one and next next..... worked.Direct radio button option did not work

LVL 7

Author Comment

by:gudii9

ID: 418574472016-10-24

one other thing i did different is run as administrator

LVL 7

Author Comment

by:gudii9

ID: 418574482016-10-24

any link on step by step examples of unix on cygwin examples starting from hello world to more complex loops etc

Featured Post

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Java performance on Solaris - Managing CPUs

Article by: Santosh

Java performance on Solaris - Managing CPUs There are various resource controls in operating system which directly/indirectly influence the performance of application. one of the most important resource controls is "CPU". In a multithreaded…

Unix OS

EE QA: Developing and Running Automated Tests for Our Website

Article by: Marlon

Introduction This article is the last of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers our test design approach and then goes through a simple test case example, how …

If Statement in Java

Video by: Salmaan

Viewers will learn about if statements in Java and their use The if statement: The condition required to create an if statement: Variations of if statements: An example using if statements:

Introduction to Arrays in Java

Video by: Salmaan

Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…