gudii9

asked on 10/21/2016

unix in java example

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();

	}

}

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please advise

JavaUnix OS

Last Comment

gudii9

8/22/2022 - Mon

SOLUTION

Thomas Wheeler

10/21/2016

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ASKER CERTIFIED SOLUTION

Gerwin Jansen

10/21/2016

THIS SOLUTION ONLY AVAILABLE TO MEMBERS.

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gudii9

10/21/2016

ASKER

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();

	}

}

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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?

gudii9

10/21/2016

ASKER

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();

	}

}

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Gerwin Jansen

10/21/2016

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...

This is the best money I have ever spent. I cannot not tell you how many times these folks have saved my bacon. I learn so much from the contributors.

rwheeler23

Gerwin Jansen

10/21/2016

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

gudii9

10/24/2016

ASKER

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

gudii9

10/24/2016

ASKER

one other thing i did different is run as administrator

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gudii9

10/24/2016

ASKER

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