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  Understand diff in Unix

diff is an important tool program in Unix. It is used to compare differences of two files, it is the foundation for code version control. If you type : $ diff <file_before_change> <file_after_change> diff will tell you what's the difference between these two files. The result may not be so easy to understand, so now I will show you how to understand diff. 1. 3 formats of diff diff has 3 formats due to historic reasons. normal diff context diff unified diff 2. Demo files For easy d...

   diff,Unix,version control,git     2012-09-03 10:49:36

  Fix issue where no Java virtual machine found when launching Eclipse

In cases where a new Eclipse is installed or the location of the Java virtual machine binaries has been changed, you may face issue when launching Eclipse. The error would look like. And if you go to the location specified in the error message, there is no such path indeed.  And when clicks OK, the program just exits. The issue here is that it tries to find the java.exe binary and launch the program but it failed to locate it and hence exits. To fix this, you first need to ensure you have...

   ECLIPSE,JAVA,LAUNCH,ECLIPSE.INI     2019-09-07 05:31:27

  How does PHP session work?

This article is about how PHP session works internally. Below are the steps : 1. Session in PHP is loaded into PHP core as an extension, we can understand it as an extension. When session extension is loaded, PHP will call core functions to get the session save_handler, i.e interface or functions for reading and writing session data. By default, PHP will handle session data by writing and reading files on the server. But PHP also supplies custom methods for handling session data, we can use sess...

   PHP, session, mechanism     2012-12-28 13:36:49

  How long does the heuristic cache of the browser actually cache?

Heuristic cache Heuristic caching is the default behavior of browser caching (i.e., for responses without Cache-Control), which is not simply "not caching", but implicitly caching based on the so-called "heuristic cache". HTTP is designed to cache as much as possible, so even if Cache-Control is not specified, the response will be stored and reused if certain conditions are met. This is called heuristic caching. HTTP/1.1 200 OK Content-Type: text/html Content-Length: 1024 Date: Tue, 22 Feb 2022 ...

   HEURISTIC CACHE,WEB DESIGN     2023-05-26 08:40:13

  Jack Ma speaks within the company's intranet post PDD earnings report

On November 28th, PinDuoDuo(PDD) released its financial report for the third quarter of 2023, ending on September 30th. The revenue for the third quarter was 688.4 billion RMB, showing a year-on-year growth of 93.9%. The net profit, according to the U.S. General Accounting Standards, reached 15.54 billion RMB, with a net profit margin of 22.6%. PDD attributed its overall positive performance to the accelerated recovery of the consumer market and the vigorous implementation of its "high-qual...

   PDD,JACK MA,ALIBABA     2023-11-29 06:02:09

  Leveraging Dedicated Server Hosting for Data Analytics Firms

In the age of data-driven decision making, data analytics firms require powerful and reliable computing resources to extract insights from massive data sets. A dedicated server is a type of server that is solely allocated to a single user or organization. In this article, we will explore the benefits of using a dedicated server for data analytics firms. Enhanced Performance A dedicated server offers enhanced performance that cannot be matched by other types of servers. Here are some of the benef...

   HOSTING SERVICE     2023-05-12 04:18:56

  Apache Tomcat Installation and Configuration

When you want to install Apache Tomcat on Windows System. You may find that there are some tricky parts. Next I will elaborate the steps to install and configure Tomcat. If you want to install Tomcat as a service without GUI. You need to download the 32-bit Windows.zip from http://tomcat.apache.org/download-70.cgi. After downloading this zip file. You need to unzip this file to the directory which you want to put this software to. After unzipping, you can go to the bin directory and find t...

   Tomcat 7,Windows,Apache,Install,Configur     2011-04-10 14:17:21

  Marissa Mayer brings 2nd Googler to Yahoo

A week ago, Anne Espiritu who was responsible for Google's public relations before leaving Google joined Yahoo, she became the first Googler Mayer brought to Yahoo. According to CNBC's Jon Fortt on Twitter, Google's former project manager Patricia Moll Kriese also left Google, formally joined Yahoo! as Senior Director of Yahoo's corporate projects.Although this news has not been confirmed by both companies, Patricia Moll Kriese's personal page on LinkedIn revealed that she left Google in August,...

   Yahoo,Marissa Mayer,Googler     2012-08-10 13:38:15

  Learn Emacs: Keyboard Macros

An emacs keyboard macro is just a recording of user input into emacs, which means that most anything you can do in emacs can be recorded as a macro. Read that again. Pretty powerful.Here’s how it works. To start recording, typeC-x (and input the commands in your macro. Then typeC-x )to stop recording. Then typeC-x eto apply the macro once, orC-u 0 C-x eto apply the macro until the bell rings or end of buffer is reachedKeep in mind that you must not ring the bell when defining a keyboard m...

   Emac,Macro,Code,Example     2011-11-10 10:45:47

  How Kafka achieves high throughput low latency

Kafka is a message streaming system with high throughput and low latency. It is widely adopted in lots of big companies. A well configured Kafka cluster can achieve super high throughput with millions of concurrent writes. How Kafka can achieve this? This post will try to explain some technologies used by Kafka. Page cache + Disk sequential write Every time when Kafka receives a record, it will write it to disk file eventually. But if it writes to disk every time it receives a record, it would ...

   BIG DATA,KAFKA     2019-03-08 09:42:57

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