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Guide to Implement an SSH Client Using Golang
SSH, short for Secure Shell, is a network protocol used for securely remote logging into other computers on a network. I believe most backend developers are familiar with SSH. Common shell tools used for logging into servers, such as Xshell, SecureCRT, and iTerm2, are all based on the SSH protocol. In Golang, the crypto/ssh package provides functionality for implementing an SSH client. In this article, we will explain in detail how to implement an SSH client using Golang. Creating SSH Client Con...
SSH CLIENT,GUIDE,SSH,GOLANG 2023-11-11 09:19:29
Create temp file in Bash using mktemp and trap
When working on Linux Bash, sometimes there is need to create temporary file. A common way of creating temp file on Linux is creating some file in /tmp directory. However there is security risk when creating temp file in /tmp directory. This post will show how to securely create temp file in Linux Bash. When creating file in /tmp directory, there are some security risks. This directory can be accessed by any user on the system, any user can write data into this directory as well. The files creat...
C programming tips in SPARC architecture
If you are a newbie of C programmers in SPARC architecture (For example, working on Solaris), you should pay attention to the following tips:(1) By default, SPARC is big-endian (For Endianness, you can refer http://en.wikipedia.org/wiki/Endianness). It means for an integer (short, int, long, etc), the MSB will be stored in the lower address, while the LSB will be stored in the higher address. (2) SPARC requires byte-alignment. It means for a short (2 bytes long) variable, the star...
C 2014-06-01 03:56:30
Tips of Drafting an R Markdown Document
When presenting the data summary and exploratory analysis, we used to copy a lot of tables, charts from Rstudio to PowerPoint, which makes the presentation preparation painful. It becomes essential for data scientists to make use of better reporting tools, such as R markdown, Jupyter notebook to prepare the analysis presentation in a more efficient and organized way. Of course, we want this to be reproducible! In this post, I would like to share some tips of using the right tools to draw tables,...
R PROGRAMMING 2020-11-01 23:09:45
Add Sublime Text to your context menu on right click
When opening a text file, you may be used to right click on the file to be opened and then choose the application which can open the file from the context menu. On the context menu, you may see a menu item like "Edit with Notepad++". Nowadays many people especially programmers like to use Sublime Text, but by default this application will not show on the context menu when you right click on a file. There is now frequent request to add this application to the context menu. Here we show a simple b...
SUBLIME TEXT,CONTEXT MENU,WINDOWS 2015-10-19 08:51:25
A mini guide to HTTP referer
In HTTP header, there is a field named Referer which is to provide the referrer of the current accessed page. In this post, we will introduce the usage of HTTP referer field. On the web, when a user visits a webpage, s/he must be from some place. This place is usually referred a s referer. This information is very important to some website operators and server owners as they want to know where they get the traffic from and this helps them provide better service for potential targeted users. In t...
HTML,HTTP REFERER,REFERRERPOLICY 2019-06-29 02:23:25
China has blocked Wikipedia again
Recently lots of Chinese found they experienced problems while trying to access Wikipedia, the world's largest and most well-known free encyclopedia. It turns out that the notorious Chinese GFW(Great Firewall) is playing the critical role here. It blocks the Chinese version of Wikipedia. The reason why the Chinese version of Wikipedia is blocked is said to be that Wikipedia has changed its default protocol from HTTP to HTTPS. This change made it difficult for the GFW to filter some sensiti...
Greedy and Nongreedy Matching in a Regular Expression
By default, pattern matching is greedy, which means that the matcher returns the longest match possible. For example, applying the pattern A.*c to AbcAbcA matches AbcAbc rather than the shorter Abc. To do nongreedy matching, a question mark must be added to the quantifier. For example, the pattern A.*?c will find the shortest match possible. COPY // Greedy quantifiers String match = find("A.*c", "AbcAbc"); // AbcAbc match = find("A.+", "AbcAbc"); // AbcAbc // Nongreedy quantifier...
Regular expression,Pattern match,Greedy, 2011-08-09 12:42:28
this in JavaScript
this is a keyword in JavaScript. It refers to an internal object created automatically when a function executes, it can only be used in a function. For example: function test(){     this.x = 1;   }The this keyword will change when a function is called in different situations. However, the general rule is : this refers to the object which calls the function.Next we discuss the use of this in 4 different situatio...
this,keyword,use,JavaScript 2012-05-05 12:47:37
Ubuntu and GNOME jump the shark
I upgraded to Ubuntu 11.04 a week or so back in order to get a more recent version of SCons. 11.04 dropped me into the new “Unity†GNOME interface. There may be people in the world for whom Unity is a good idea, but none of them are me. The look is garish and ugly, and it takes twice as many clicks as it did before to get to an application through their supposedly “friendly†interface as it did in GNOME Classic. No, dammit, I do not want to text-search my applic...
Ubuntu,GNOME,Open source,Unity 2011-10-17 11:19:00
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