Finding your WAN IP address

jrobertson (James Robertson) — Fri, 11 Apr 2008 09:14:36 GMT

My server sits behind a NAT router, so finding out my public IP address is a non-trivial task. I can use curl to poll checkip.dyndns.org for my current address:



curl -s checkip.dyndns.org

The current IP check returns the information in this format: Current IP CheckCurrent IP Address: 216.239.39.99

Using cut, I can extract just the information that I need:



curl -s checkip.dyndns.org|cut -d ":" -f2|cut -d "<" -f1

That produces something a bit more readable: 216.239.39.99

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This article snippet was copied from My sysadmin toolbox [linux.com] while I was googling for 'apt-cache search dyndns'.

Cutting of part of the unicode line

gugu (Andrey Kostenko) — Fri, 01 Dec 2006 18:52:04 GMT

// description of your code here



sub left_subject{

	my $self=shift;

	my $count=shift;

	use utf8;

	my $topic=$self->subject;

	utf8::decode($topic);

	utf8::upgrade($topic);

	my ($subtopic)=($topic=~/(.{0,$count})/);

#	utf8::decode($subtopic);

	$subtopic=~s/\b\w{1,5}$//;

	utf8::downgrade($subtopic);

	return $subtopic.'...';

}

Java - CUT&PASTE

whitetiger () — Thu, 26 Oct 2006 18:39:27 GMT

// Cut&Paste Method



package system.clipboard;



import java.awt.GridBagConstraints;

import java.awt.GridBagLayout;

import java.awt.datatransfer.Clipboard;

import java.awt.datatransfer.ClipboardOwner;

import java.awt.datatransfer.DataFlavor;

import java.awt.datatransfer.StringSelection;

import java.awt.datatransfer.Transferable;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;	 



import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JTextArea;



public class ClipBoard extends JFrame implements ClipboardOwner, ActionListener

{

	private static final long serialVersionUID = 1L;

	

	JTextArea srcText, dstText;

	JButton copyButton, pasteButton;

	Clipboard clipboard = getToolkit().getSystemClipboard();



	public ClipBoard()

	{

		super("Clipboard Test");

		

		GridBagLayout gridbag = new GridBagLayout();

		GridBagConstraints c = new GridBagConstraints();

		

		setLayout(gridbag);

		

		srcText = new JTextArea(8, 32);

		c.gridwidth = 2;

		c.anchor = GridBagConstraints.CENTER;

		gridbag.setConstraints(srcText, c);

		add(srcText);



		copyButton = new JButton("Copy Above");

		copyButton.setActionCommand("copy");

		copyButton.addActionListener(this);

		c.gridy = 1;

		c.gridwidth = 1;

		gridbag.setConstraints(copyButton, c);

		add(copyButton);

		

		pasteButton = new JButton("Paste Below");

		pasteButton.setActionCommand("paste");

		pasteButton.addActionListener(this);

		pasteButton.setEnabled(false);

		c.gridx = 1;

		gridbag.setConstraints(pasteButton, c);

		add(pasteButton);

		

		dstText = new JTextArea(8, 32);

		c.gridx = 0;

		c.gridy = 2;

		c.gridwidth = 2;

		gridbag.setConstraints(dstText, c);

		add(dstText);

		

		pack();

	}

	

	public void actionPerformed(ActionEvent evt)

	{

		String cmd = evt.getActionCommand();

		

		if(cmd.equals("copy")) 

		{

			// Implement Copy operation

			String srcData = srcText.getText();

			

			if(srcData != null)

			{

				StringSelection contents = new StringSelection(srcData);

				clipboard.setContents(contents, this);

				pasteButton.setEnabled(true);

			}

		}

		else if(cmd.equals("paste"))

		{

			// Implement Paste operation

			Transferable content = clipboard.getContents(this);

			if(content != null) 

			{

				try

				{

					String dstData = (String) content.getTransferData(DataFlavor.stringFlavor);

					dstText.append(dstData);

				}

				catch(Exception e)

				{

					System.out.println("Couldn't get contents in format: " + DataFlavor.stringFlavor.getHumanPresentableName());

				}

			}

		}

	}



	public void lostOwnership(Clipboard clipboard, Transferable contents)

	{

		System.out.println("Clipboard contents replaced");

	}

	

	public static void main(String[] args) 

	{

		ClipBoard test = new ClipBoard();

		test.setVisible(true);

	}

}

DZone Snippets: cut code

Finding your WAN IP address

Cutting of part of the unicode line

Java - CUT&PASTE