There is one statement which says Giving out your email address is like starting a relationship. What happens when you want to break up?Once you gave out your email address, you may take the risk of receiving big amount of junk emails. However, when we register on some websites, we must provide our Email address to receive authentication emails. If we cannot receive the authentication email, we cannot finish the registration process. Is there any alternative way?We can use disposable email, i.e, some email address are like disposable chopsticks, we can throw them once we finish using them.Curr...

Recently O'Reilly provided free access to some books. Some of them are even in early release status. Here we recommend 10 of them.1、Mastering Perl2、Git Pocket Guide3、Vagrant: Up and Running4、High Performance Browser Networking5、802.11ac: A Survival Guide6、Test-Driven Development with Python7、Interactive Data Visualization for the Web8、HTML5 Canvas9、Programming JavaScript Applications10、Agile DataSource : http://linuxtoy.org/archives/oreilly-new-books.html...

1. What's active mode and passive modea. FTP has two ports to control:Port 20 is for data transferPort 21 is for control or establish TCP connectionb. The process of active connectionNote: C represents Client and S represents ServerS opens port 20 and 21C connects to port 21 of S with a random port, this port can be between 1024 and 65536, it sends port+x to server at the same time to specify C(X)->S(21)When S receives the command, it will sends back ACK, S(21)->C(X)S will set up a connection between its port 20 and client's X+1, S(20)->C(X+1)C responds with an ACK,C(X+1)->S(20)c. ...

The whole world knows that security and background checks get tighten for people to enter US since Donald Trump took office. But have you ever heard about getting algorithm question asked during the immigration check interview while entering United States? Recently an Australian software engineer David Thornton had such an experience when he tried to enter US.(Image from kaytlentravels.wordpress.com)David is a software engineer from Sydney and he is a 24-year-old studied computer science and law at the University of New South Wales. In February, David just finished his study in ...

This is a technical license plate block example. We don't know whether it is working or not, however, the idea is very good. When you drive through some of the junctions, the camera captures the license number and convert it into text with OCR, and then insert them into the database. Therefore, this license plate on the car becomes a SQL injection. This picture tells us -- never trust user input.Author : 陈皓 Source : http://coolshell.cn/articles/6639.html#more-6639...

Google says that Google+ now has over 170million registered users, but according a new research report of Fast Company about Google+,  Google+ is just a virtual ghost town.This research selected a sample of 40,000 random Google+ users. The result is :The average post on Google+ has less than one +1, less than one reply, and less than one re-shareRoughly 30% of users who make a public post never make a second oneEven after making five public posts, there is a 15% chance that a user will not post publicly againAmong users who make publicly viewable posts, there is an average of 12 days betw...

Everybody talks about mastering the art of staying productive. Not many people willingly accept that such efforts are futile. It’s impossible to stay productive 100% of the time, and this will never change.Something that I believe to be just as important, if not more so, is what we make of our least productive time. We all have the capacity to be extremely productive for some part of the day. Even the world’s grandest underachievers. But I believe that to be successful running your own business, to steal a cricket metaphor, your tail has to wag. You have to find a way to maximise...

Social media is becoming a very important traffic source to one website. We can see social media share buttons or links in most websites ranging from news website to personal blogs. It is also a very important optimization area where many SEO experts recommend. There are many social medias we can share our links to such as Facebook and Twitter. Most of these website provide share button for us to easily integrate them into our websites, but these buttons usually have default styles(fixed size, fixed images). If we want to customize these buttons so that they conform to our website design grace...