I’m not a serious Linux user, but sometimes I need to use Linux. In a long time, I frequently searched a limited number of Linux commands. So I think it is a good idea to list those frequently-used ones and remember them finally. This definitely improved my work effectiveness. Here is my list. 1. cp/scp … Read more
Here is a note for how to disable this password prompt under Ubuntu 12.10. The problem looks like this whenever you open browser first time after you start your computer. Error Message: “Enter password to unlock your login keyring” Ubuntu 12.10. Alt + F2 and then type in “seahorse” Click view → keystring Right-click login … Read more
If you have a project in your eclipse workspace and you want to share it on GitHub, how to do it? Very simple! Assuming you already registered a GitHub account and you have already installed git on your computer, you can share your eclipse projects to GitHub in 2 easy steps. Note: The following approach … Read more
Consider this example: void send(int *to, int *from, int count) { int n = (count+7)/8; switch(count%8) { case 0: do{*to++ = *from++; case 7: *to++ = *from++; case 6: *to++ = *from++; case 5: *to++ = *from++; case 4: *to++ = *from++; case 3: *to++ = *from++; case 2: *to++ = *from++; case 1: *to++ … Read more
One line solves the problem. This will change margin of top, bottom, left and right at the same time. More complicated usage can be found in MIT site. \usepackage[margin=1in]{geometry}\usepackage[margin=1in]{geometry} Add this line before \begin{document}
One line before \begin{document} solves the problem! \usepackage[parfill]{parskip}\usepackage[parfill]{parskip}
Here is a beautiful Perl code example that process command line arguments with specified options. With this code snippet, you can define any number of options like a professional Perl developer in a professional way. It is pretty because it is the most precise way to specify options for command line arguments I have ever … Read more
This 10 minutes tutorial is not meant to compare Java with Perl. The purpose is to explore how to quickly learn Perl as a Java developer. The following are some key notes from my perspective. 1. Basics to Start Unlike Java, there is no need to claim a “main” method as entry point. To run … Read more
If you know Java and want to quickly get a sense of how to use Python from the very beginning, the following summary can provide you a quick review of data types. You may also find the previous comparison of Java and Python useful. By comparing data types between Java and Python, you can get … Read more
Perl is a nice script language which is easy to use. It is originated as a Unix scripting language and has been improved with a lot of new features from shell scripting, C, etc. Perl is very powerful for text processing. For an experienced developer, the useful tutorial would be a quick introduction of the … Read more
You may use CVS daily for your program, but never touch the collaboration part. In fact, that is the most exciting part. In this tutorial, I will first briefly explain the concepts of trunk, branch and tags. And then use a real team collaboration example to demonstrate how cvs works. How CVS works? First of … Read more
Some developers have claimed that Python is more productive than Java. It is dangerous to make such a claim, because it may take several days to prove that thoroughly. From a high level view, Java is statically typed, which means all variable names have to be explicitly declared. In contrast, Python is dynamically typed, which … Read more
Eclipse version: Indigo Platform: Ubuntu 11.10 Error message: An error occurred while collecting items to be installed session context was:(profile=epp.package.java, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=). No repository found containing: osgi.bundle,javax.mail.glassfish,1.4.1.v201005082020 This is possibly caused by in compatible eclipse version. If we use Help -> Eclipse MarketPlace to install PyDev, the problem is gone.
This post shows how to setup a python web development environment under Ubuntu and make a hello world example. So Python has become a hot word in recent years. But before you can do anything about it, you need a “hello world” sample application. In this post, I will build a hello world Python web … Read more
Github is a more popular and social code repository. It is the trend to be a user, at least it is true for now. There are a lot of problems we may meet, most of them can be solved by reading the documentation. But that is not fast or something we like to do. Problem … Read more