If you want to use IPv4 in one command, just run following:

$ sudo apt -o Acquire::ForceIPv4=true update

If you want to force to use IPv4 for all apt operations, add a new file under /etc/apt/apt.conf.d/

$ sudo nano /etc/apt/apt.conf.d/99force-ipv4

Then add a line:

Acquire::ForceIPv4 "true";

If you want to disable IPv4, change the IPv4 to IPv6.

The post Force IPv4 when using APT command in Ubuntu appeared first on David Yin's Blog.

Infographic created by IOTransfer – iPhone manager for iPhone/iPad backup and management.

The post Things You Don’t Know about iPhone : Infographic appeared first on David Yin's Blog.

1.      Be Diverse with Links and Anchor Text

The best way to protect your small business site from getting slapped by Penguin is to have a great deal of diversity with your anchor text and link building. Anchor text is what creates links on your page (or “clickable” text,) and this is mostly what Google Penguin is targeting. If you create too much of this text on your site and do not diversify your keywords and anchor text, there is a good chance that you might incur a penalty.

Instead of trying to use these keywords to increase your ranking, try to focus on the right kind of link building that will both avoid this problem and bring increased traffic to your site. The links that you create should be focused on quality, not quantity. This may take some more time and effort on your part, but effective Google marketing is not accomplished overnight, so building up a quality website with researched keywords will help you avoid incurring future penalties.

2.      Avoid Older Link-Building Tactics

Some small business owners take advantage of forum profiles and comments with built-in backlinks for link building, but this is now a dangerous tactic with Google Penguin. It’s easy to create these links, but it is unwise to rely on them too much. Even if you are making relevant comments on a site, if you make too many, you might be targeted. Instead, focus on creating backlinks from quality sites.

Link building through social sites, such as Twitter and Facebook, is usually more effective when it comes to both increasing traffic and protecting your site from being penalized. If you want to avoid the Google Penguin slap, then learning quality link building can be one of the best ways to do so.

3.      Remain in the Know

One of the most effective ways to avoid being penalized by Penguin can be to stay informed about changes to the algorithm. This can help you avoid making errors that you might otherwise make out of ignorance when it comes to link building for business.

Google creates updates at least a few times over several years and the results from previous updates may take time to show, so track your rankings carefully and set up Google alerts for keywords pertaining to Penguin algorithm changes to ensure that you’re always in the know when it comes to keeping your site on track with the company’s link building guidelines. You can also follow the company on social media to read about the latest news and updates.

4.      Look To Successful People for Guidance

Proper coding, link building, and backlinking can be frustrating, especially when your business is new and there are many other duties to perform. However, you can look for guidance by following in the footsteps of other successful entrepreneurs, such as technology and communications expert Peter Foyo, who has used his knowledge and talent to build his company, Principal Standard Group, to international success. Studying his techniques and those of other powerful entrepreneurs can keep you motivated, even when the odds seem insurmountable.

Staying in the good grace of Google Penguin and its algorithms can be daunting for you as a small business owner. However, staying updated and building healthy linking practices can help you succeed.

The post Google Penguin and Link Building for Small Businesses: 4 Tips appeared first on David Yin's Blog.

via

The post How to determine Water Heater Age appeared first on David Yin's Blog.

• Add new feature: Hungarian menu support.
• Fix bug: O!Play will restart when inserting ASUS HS-1000W.
• Added MKV header compression format support
• Fixed the bug: The “N” letter of Greek subtitle cannot be displayed correctly on the screen.

Upgrade process is very simple.
1) Download firmware from Asus Tek site.
2) Extract it to a USB disk.
3) Turn on media device, Asus O!Play HDP-R1
4) Plug USB disk to media player.
5) Click setup, System, firmware, upgrade, confirm.
After a few minutes, the system upgrade done.

The post Asus O!Play HDP-R1 V1.38N appeared first on David Yin's Blog.

CityVille is a wonderful game. I like it.

If you have never played it, just try it.

If you try it, you will like it.

If you like it, you can not stop playing.

This is only half of my City.

The tips to expend your city are very simple. I would like to share my experience.
1) Check your city regularly. At least 4 hours a time at daytime.

2) Farming is best to use 1 day corn, 2.1 days wheat, and 3.1 days peas. If there are no task to harvest others.

3) Use City sidewalk to connect buildings, which can save space for building.

4) Click your neighbors post on the Game, when you give your gift, you get one as reward.

5) More friends, more neighbors. This is the key to make your city expending faster.

I have more than 40 neighbors on CityVille.

If you need fiends on CityVill, please add me. I like to have more friends on CityVille and you will have an active neighbor too.

Click below to add me.
David Yin

Create Your Badge

The post Expend your CityVille by more friends appeared first on David Yin's Blog.

require_once("/path"/to/file.php");

When do this kind of including, should be very careful on following parts.
1) The path to the script is wrong.
2) The path to the script is correct, but the script is in a forbidden directory.
3) The include file has a blank line or space before or after the code in the PHP script.
It is very easy to omit the space after the code.
4) The include file can be viewd by non-PHP methods.
5) You’re in include overload.
6) You are using unchecked variables as include filenames.
It may make your site unsafe in some situation.
The tips of including file are learned from “Wicked Cool PHP”

The post What can go wrong when including another file into your php file appeared first on David Yin's Blog.

1. Single-quoted strings.

Use single quote when possible. It is faster than double quote.
If it is string only, just pick single quotes.

2. The way output data.

Could you point which is the fastest way to output from below?

print "Hi my name is $a. I am $b";
echo "Hi my name is $a. I am $b";
echo "Hi my name is ".$a.". I am ".$b;
echo "Hi my name is ",$a,". I am ",$b;

The last one is actually the fastest operation.

3. Use single-quotes around array indexes.

So, $x[‘sales’] is alway best format and fast.

4. Don’t use short open tags.

<?php is formal tag.

5. Use regular expressions only when you really need it.

When doing string operation, like replace part of string.
strtr is the fastest.

str_replace is faster.

preg_replace is slow.

6. Don’t use functions inside a loop declaration.

Bad:

for ($i = 0; $i < count($array); $i++) {
//stuff
}</pre>
<strong>Good:</strong>
<pre class="brush:php">$count = count($array);
for($i = 0; $i &lt; $count; $i++) {
//stuff
}

7. Never rely on register_globals or magic quotes.

When building new program, do not use it.

The next three is a good habit for coding, not only for PHP, but to all language coding.

8. Always initialize your variables.

9. Document your code

10. Code to a standard.

The post Another Ten PHP Optimization Tips appeared first on David Yin's Blog.

The code can break down as shown here:
“cht=p3” is the chart type, in this case, a 3D pie chart.
“chd=t:50,10,40” are the chart values, text-encoded, and separated by a comma.
The number should be ranged from 0 to 100.
“chs=500×200” is the custom chart size, 500 by 200 pixels.
“chl=PR|HTTP Status|Whois” are the different labels for the pie chart sections, separated via the pipe character. Chinese is not supported by Chart API.
chart types include: line charts, bar charts, pie charts, Venn diagrams & scatterplots.

The post Google Chart API appeared first on David Yin's Blog.

The post jQuery category created appeared first on David Yin's Blog.

6) Ubuntu Tutorials
7) Ubuntu Demon’s Blog
8) Only Ubuntu Linux
9) Jonobacon
10) Ubuntux
Somehow the list will become longer and longer. If you have some great site, just comment it below.

The post Top 10 Ubuntu Blogs appeared first on David Yin's Blog.

shutdown -f -s -t 3600

It means after 3600 seconds, the computer will be forced to shutdown.
-s Shuts down the local computer
-f Forces running applications to close.
-t xx : Sets the timer for system shutdown in xx seconds. The default is 20 seconds.
If you want more detail of this command, click here.

The post Schedule to shutdown your Windows XP appeared first on David Yin's Blog.

Set up guest PCs in your branch offices for on-the-go employee.
Transport data on thumb-drive storage devices.
Make enterprie apps accessible by Web browser.
Use SSL VPN connections for temporary PCs to ensure security. SSL performs a disconnection cleanup so work history is automatically scrubbed from borrowed PCs.
Carry a cell phone and PDA. Even if they’re relegated to checked baggage, they have a better chance of going undamaged.

What about you travel with Laptops

If not allowed a scarry-ons, ship laptops. They’re insured and traceable.
Encrypt data so precious information isn’t lost if the machine goes missing.
If authentication tokens are used, pack them separately so thieves can’t find everything in one place.
Consider ruggedized laptops, hard-sided suitcases, or cushioned laptop cases to better withstand rough lugage handling.
Use a Transportation Security Administration combination lock on suitcases with laptops inside. TSA baggage screeners can use a master key to open the lock, search the suitcase, then relock the bag.

One more thing, if you travel with your rental car, check anything left in the car, before return it.
My friend work for Hertz, he said almost every car has something left. From flash disk to GPS devices.

The post How to prepare your business travel appeared first on David Yin's Blog.