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  var in JavaScript

Geoff published an article sometime ago--"How one missing var ruined our launch". This article described one case where MelonCard uses Node.js as their backend system, suddenly there was a small registration peak period--50-100 people registered concurrently, then the entire website stopped responding and many other strange problems showed up. When they were investigating the source of the problem, they found one missing var in the following code.app.all(‘/apps/:user_id/status’, fun...

   JavaScript,Scope,variable     2012-05-26 12:35:36

  Unix directory hierarchy history

As a beginner user of Unix or Linux, people would frequently get confused about the use of different directories of the system.  For example, there is a /bin directory under root(/), it is used to store binary files. However, there are /usr/bin and /usr/local/bin under /usr which are used for storing binary files as well. Some systems even have /opt/bin. What are the differences among them? Though there are articles explaining different directories in *nix such as Filesystem Hierarchy Stan...

   UNIX,LINUX,FILESSYTEM,DIRECTORY HIERARCHY,HISTORY     2016-10-21 23:47:17

  37 powerful Linux shell commands

To work on Linux platform, you cannot avoid using shell commands to complete some tasks. These tasks can be as simple as list files in some directories or find some text in some file, or can be as complex as monitoring processes. In this post, we will share 37 powerful Linux shell commands.   Task Commands 1 Delete file with 0 byte(empty file) find . -type f -size 0 -exec rm -rf {} \;find . type f -size 0 -delete 2 Check process memory consumption ps -e -o "%C : %p : %z : %a"|sort -k...

   Linux command,List     2013-09-16 07:47:16

  Google's Business Operations in China Amid Antitrust Scrutiny

Google's journey in China has been complex, marked by strategic retreats and limited re-engagements. As of February 2025, while many of Google's consumer services remain inaccessible within mainland China, the company maintains a presence through specific business operations. However, Google's standing in China faces fresh challenges as the Chinese government recently launched an antitrust probe into the company's activities. This move comes amid rising tensions over trade and technology between...

   GOOGLE,BUSINESS,CHINA,ANTI-TRUST     2025-02-12 09:33:05

  Linux Clock : CST,UTC and NTP setup

1. There is an option when you set up clock on installing Linux: system clock users UTC, so what does UTC mean? It's Universal Time Coordinated(UTC), there are two different times in GPS system: one is UTC , the other one is LT(Local Time). The difference between these two is just the timezone difference, UTC is the time in timezone 0. If the local time in Beijing is 8 o'clock in the morning, then UTC time is 0 o'clock, which is a 8 hour difference. 2. In Linux, when we use date to check the tim...

   Linux,Clock,UTC     2013-03-21 12:19:30

  Snapkidz for children under 13

According to 36 Kr, in the past, you must be over 13 years old to register on Snapchat, while Snapchat added a new feature called Snapkidz in the latest version of its iOS app last weekend, users under 13 years old can use it now.In short, Snapchat categorize users using people's age. For users older than 13, there are no many changes; but for those younger than 13, you can also fill out the registration form, but these information are not sent to Snapchat for registering a new account, instead...

   Snapchat,Snapkidz,13     2013-06-24 09:49:17

  When can Chinese buy fresh food online?

Farmigo is an online agricultural marketing platform. Farmers can post their own products, people can directly purchase their favorite ingredients on it. Farmigo promises that fresh ingredients will be sent to the designated location within 48 hours, but the price is 20-30% cheaper than the supermarket.In other words, Farmigo itself does not sell agricultural products, it just plays a platform intermediary role. Their advantages to attract consumers are fresh ingredients supply, home delivery a...

   Agriculture, Online sales, B2B     2012-12-12 13:37:03

  Google open sources its Collaborative IDE

July 9, 2012 news, Google engineer Scott Blum published an article on Google+ which revealed that Google would open source the Collaborative IDE. The project was named "Collide" (collaborative IDE), which is a Web collaborative code editor. Google hopes that Collide can serve as a catalyst for improving the state of web-based IDEs.Caution Collide does not have any proper auth, SSL support, or user account management just yet. Please consider that fact when running instances that expose important...

   Google,Open source,Collide IDE     2012-07-09 10:55:20

  Install and setup vsftpd on AWS server

When developing websites, frequently we may need to upload source codes to the remote server. To ease of thew work, many website developers set up FTPs to upload the files. This post is a tutorial on how to install and setup vsftpd on a server. vsftpd is a very popular FTP service on Unix-like systems. Open command terminal, then install the vftpd by issuing command yum install vsftpd or sudo apt-get install vsftpd After installing the vsftpd, the config file needs to be updated based on the ope...

   FTP,vsftpd,AWS,Passive,Active     2015-02-02 02:20:27

  Build RPM package on Linux

1. Check the OS version and core version #uname -a #more /etc/redhat-release 2. Create relative directories /usr/src/redhat/SOURCES    //Store source codes, patches, icons etc /usr/src/redhat/SPECS        //Store specs about the process of building RPM packages /usr/src/redhat/BUILD     //File after uncompressed are stored here /usr/src/redhat/RPMS     //Store the binary files built with rpmbuild /usr/src/redhat/SRPMS&nbs...

   RPM,Linux,Build     2013-03-22 12:44:29

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