自由软件与Linux技术果园

Compiz-fusion on Thinkpad SL400, NVIDIA Card.

2010-01-24T22:38:00.003+08:00

1 - Set USE flagsx11-libs/libX11 and media-libs/mesa with xcb enabled.x11-libs/cairo with glitz, xcb and svg enabled.x11-wm/compiz-fusion with emerald enabled.2 - Keywordsdev-python/compizconfig-python x11-wm/compiz x11-wm/compiz-fusion x11-plugins/compiz-plugins-main x11-plugins/compiz-plugins-extra x11-plugins/compiz-plugins-unsupported x11-wm/emerald x11-themes/emerald-themes x11-apps/ccsm x11

Ruby让你成为一个愉悦的开发者

2009-12-10T22:49:00.003+08:00

在最近工作的几个项目中，我有意无意的采用了Ruby语言。作为一种介于主流与非主流之间的动态语言（TIOBE排名10左右），采用ruby的开发者群体在一度暴涨之后，一直处于一个相当稳定的水平。从效率来看，ruby确实不是一个让人完全满意的选择。在我以前一个项目中实现的一个搜索项目，最先采用了一个PHP的版本，运行起来显示了php一贯的高效和稳定特性。后来采用了ruby进行功能扩展，开发的过程让人愉悦，少量的代码实现了全部功能，并且增加了灵活性，但是在数据量急遽增加的时候，ruby的表现并不如php那样轻松自在。jruby等正在尝试通过新的手段来对这个方面进行改进，前面的路还有很长，值得期待。而抛开这个瑕疵，Ruby语言本身的优雅简洁，却能将开发者吸引到它的圈子。ruby强调代码的质量，在ruby的世界里，到处看到的是短小精悍的代码，寥寥几行，可以清晰看到进程的脉络。

curl -4 --head -H "Host 203.166.178.9" http://www.liulantao.com/images/lax_shetou.gif

2009-09-25T21:35:00.001+08:00

lax@homex ~ $ host www.liulantao.comwww.liulantao.com has address 203.166.178.9lax@homex ~ $ curl -4 --head -H "Host 203.166.178.9" http://www.liulantao.com/images/lax_shetou.gif HTTP/1.1 200 OKDate: Fri, 25 Sep 2009 13:19:45 GMTServer: Apache/2.0.52 (Red Hat)Last-Modified: Sat, 07 Feb 2009 07:30:15 GMTETag: "1208ae-16be-1bc9efc0" Accept-Ranges: bytesContent-Length: 5822Connection:

What is Test-Driven Development in Ruby?

2009-09-25T10:49:00.000+08:00

TDD steps:1, Write a test that describes some shortcoming or missing feature in the code. 2, Run the tests.3, Write just enough code to make this test pass. 4, Run the tests again. 5, Refactor. 6, Write a test to define a new feature and start the process all over again.Always remember:1, Code doesn't exist yet until it's tested. 2, Run tests religiously. see more: 1, http://ruby.about.com/od/

rake db:drop with permission denied error.

2009-09-24T14:42:00.001+08:00

>rake db:drop Couldn't drop db/development.sqlite3 : #maybe you run script/console and didn't exit.-- Liu Lantao College of Information Science and Technology, Beijing Normal UniversityEMAIL: liulantao ( at ) gmail ( dot ) com ; WEBSITE: http://www.liulantao.com/ .------

A journey to Gentoo: Intel video card and xorg installed.

2009-09-16T23:51:00.001+08:00

config intel video card on Gentoo Linux.first, make sure the kernel module option, "Device Drivers --> Graphics support --> Direct Rendering Manager --> Intel 810" should be checked for my i810 card. then set VIDEO_CARDS="intel" in /etc/make.conf.now, reinstall xorg-x11: # sudo emerge -uDNva xorg-x11.when all above steps were finished, remove /etc/X11/xorg.conf, run $ startx, and everything is

Installing Chromium Web Browser on Fedora 11.

2009-09-07T22:38:00.001+08:00

[lax@homex ~]$ sudo vim /etc/yum.repos.d/chromium.repo [chromium]name=Chromium Test Packagesbaseurl=http://spot.fedorapeople.org/chromium/F$releasever/ enabled=0gpgcheck=0[lax@homex ~]$ sudo yum install *chromium* --enablerepo=chromiumLoaded plugins: aliases, fastestmirror, refresh-packagekitLoading mirror speeds from cached hostfile * fedora: ftp.cuhk.edu.hk * rpmfusion-free:

Output of an Array to sentence, the ruby way

2009-09-07T22:35:00.001+08:00

@contacts.collect{|s| s.name}.to_sentence.concat(".") -- Liu LantaoEMAIL: liulantao ( at ) gmail ( dot ) com ; WEBSITE: http://www.liulantao.com/ .------

西四新开的一家奶酪魏

2009-09-06T20:53:00.001+08:00

奶酪魏，西四店，今年入夏新开的店。老字号的牌子，进去店面不大，装修得简单，但是也干净整洁。奶酪白色小瓷碗，一般是7元。此外还有奶酪卷、奶酪干等品种。我要了一碗原味的，很好吃，入口滑而不腻，奶的香醇之气全在其中，回味很久。平时吃的现酿酸奶与它相比，瞬间就没有了一点儿吸引力。地点嘛，22路、826路等公交车在平安里路口南，路东。过段时间西四的地铁开通，应该更方便了。奶酪魏第一家店位于前门门框胡同15号，名字为麟记酪铺，在经常是极为有名的了，梁实秋的文章中曾有描述。 -- Liu LantaoCollege of Information Science and Technology, Beijing Normal UniversityEMAIL: liulantao ( at ) gmail ( dot ) com ; WEBSITE: http://www.liulantao.com/ .

Config rubygems and rails in ubuntu.

2009-09-02T18:52:00.001+08:00

sudo apt-get install rubygems sudo gem install rubygems-update sudo update_rubygems sudo apt-get install libsqlite3-dev sudo gem install sqlite3-ruby rails-- Liu LantaoCollege of Information Science and Technology, Beijing Normal University EMAIL: liulantao ( at ) gmail ( dot ) com ; WEBSITE: http://www.liulantao.com/ .------

Unix-like系统用户交流信息的几个小命令

2009-08-29T21:44:00.001+08:00

向系统所有在线用户发送消息：$ wall [message]如果想设定是否接收这个消息：$ mesg [y|n]向特定用户发送小心：$ write user [ttyname]$ talk person [ttyname] 也可以通过mesg来设定。当然还有选项更丰富的mail命令：$ mail [-iInv ] [-s subject ] [-c cc-addr ] [-b bcc-addr ] to-addr... $ mail [-iInNv -f ] [name ] $ mail [-iInNv [-u user ] ] -- Liu LantaoOak Pacific Interactive Corp. Ltd.EMAIL: liulantao ( at ) gmail ( dot ) com ; WEBSITE: http://www.liulantao.com/ .---

Google Sets is cool!

2009-08-25T14:21:00.001+08:00

Use Google Sets to expand a list of a few items, into a list with many items. For example let's suppose you want a set (or list) of Star Wars characters, but can only think of a few. Enter a the ones you can think of, and Google sets will return a whole list. links: http://labs.google.com/sets-- Liu LantaoCollege of Information Science and Technology, Beijing Normal UniversityEMAIL: liulantao (

How-to: disable the PING response.

2009-08-25T11:42:00.001+08:00

To disable the PING response, add the following line to your init script for the network:echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_allTo reenable the PING response do this:echo 0 >/proc/sys/net/ipv4/icmp_echo_ignore_all To make the change PERMANENT add the following line to /etc/sysctl.conf:net.ipv4.icmp_echo_ignore_all=1and execute this commandsysctl -pIt is better to use firewall for these

sed -i 's/str1/rep1/;s/str2/rep2/;...;s/strN/repN/' urfile

2009-08-14T17:32:00.001+08:00

sed -i 's/str1/rep1/;s/str2/rep2/;...;s/strN/repN/' urfile-- Liu LantaoCollege of Information Science and Technology, Beijing Normal UniversityEMAIL: liulantao ( at ) gmail ( dot ) com ; WEBSITE: http://www.liulantao.com/ .------

Nginx访问日志统计：按时间计数

2009-08-07T16:33:00.001+08:00

$ grep "GET / " access.log | awk '{print substr($4,2,14)}' | uniq -c 4275 04/Aug/2009 14 11484 04/Aug/2009 15 10145 04/Aug/2009 16 9718 04/Aug/2009 17 7522 04/Aug/2009 18 8169 04/Aug/2009 19 8385 04/Aug/2009 20 9033 04/Aug/2009 21 8356 04/Aug/2009 22 6144 04/Aug/2009 23 3457 05/Aug/2009 00 1698 05/Aug/2009 01 853 05/Aug/2009 02 534 05/Aug/2009 03 393 05/Aug/2009

something about xulrunner and xpcom

2009-07-28T16:01:00.001+08:00

----------- addProgressListener( listener, notifyMask ) Return type: no return value Add a progress listener to the browser which will monitor loaded documents. The progress listener should implement the nsIWebProgressListener interface. ----------------loadURI( uri, referrer, charset ) Return type: no return value Load a URL into the document, with the given referrer and character

.htaccess

2009-07-27T15:06:00.001+08:00

.htaccessOrder Deny,AllowDeny from allAllow from 10.0.0.0/8-- Liu LantaoCollege of Information Science and Technology, Beijing Normal University EMAIL: liulantao ( at ) gmail ( dot ) com ; WEBSITE: http://www.liulantao.com/ .------

nagios中主机依赖与服务依赖

2009-07-22T09:46:00.000+08:00

主机依赖：A主机依赖于B主机服务依赖：A服务依赖于B服务服务依赖有几种情况：A主机上的X服务依赖于A主机上的Y服务A主机上的X服务依赖于B主机上的X服务A主机上的X服务依赖于B主机上的Y服务依赖关系在主机和服务之间有很重要的地位。比如服务依赖的情况，很多服务都依赖于主机的可连接性，网页的可访问依赖于web服务器的状态。一般情况下，如果主机已经死掉，它上面的其它服务的监测也会失败。如果主机上的服务由不同的管理员负责，通过nagios进行检测，只需通报主机已经down掉的消息给系统管理员即可，因为即使得到其它相关服务无法访问的消息，其它服务管理员无力处理这个问题。nagios默认能够支持刚才提到的依赖。主机依赖也有相似的状况，比如A主机通过B主机连接网络提供服务，如果监测到B主机停止的话，则不再对A主机进行监测。主机依赖通过hostdependency进行定义。参数格式定义

在北京听到布谷鸟了

2009-05-13T00:57:00.001+08:00

这个夜晚，开始听到窗外布谷鸟叫。麦子，马上要收割了。城市之中竟然能听到布谷鸟，很神奇吧。大家都加油吧 -- Liu LantaoCollege of Information Science and Technology, Beijing Normal UniversityEMAIL: liulantao ( at ) gmail ( dot ) com ; WEBSITE: http://www.liulantao.com/ . ------

Working Productively in Bash’s Vi Command Line Editing Mode (with Cheat Sheet)

2009-05-12T09:28:00.001+08:00

[ This article is from Peteris Krumins' blog, and you can read original aritle here:http://www.catonmat.net/blog/bash-vi-editing-mode-cheat-sheet/. ] Bash provides two modes for command line editing - emacs and vi. Emacs editing mode is the default and I already wrote an article and created a cheat sheet for this mode. This time I am going to introduce you to bash's vi editing mode and give out a

Subversion主干-分支开发的流程。

2009-04-28T13:09:00.001+08:00

使用Subversion辅助开发，有一个重要的概念就是主干与分支。采用主干与分支的开发方法，可以有几种不同的策略：1、主干上开发，分支上发布。发布之后，如果分支有BUG（主干可能也是有的），则在分支上修改BUG。然后合并到主干。分支的发布继续进行。这个一般适用于客户化软件工程的。 2、主干保持一个最新的稳定版本，保证随时能提供稳定的发布版本。而所有的新功能、新技术实验全放在分支上去做开发，进行新技术的验证实验。等分支相对稳定以后，再合并到主干上形成稳定的发布版本。此时就要更新主干，进行主干版本的升级。很多开源软件基本采取这种策略。 3、还有一种就是这两者的混合，结合两者的优点，即保证随时可以有稳定的版本发布，又能保证客户化的版本分支开发功能及其客户化版本的维护。下面介绍采用第2中策略的详细步骤和命令。以trunk为主干目录，branches下为分支目录。在分支进行开发，

Install and Config Sun Java Runtime Environment: How-to.

2009-04-25T17:49:00.001+08:00

Install and Config Sun Java Runtime Environment: How-to. [ http://www.liulantao.com/ ] First, get the latest jre from SUN and get the rpm.Go-to http://java.com/en/download/manual.jsp, and choose the rpm file. Then install it using rpm[lax@liulantao-com JAVA]$ sudo rpm -Uvh jre-6u12-linux-i586.rpm Make the system recognize it.[lax@liulantao-com ~]$ sudo /usr/sbin/alternatives --install /usr/bin/

在Linux上编译安装SUN拼音输入法｜Build SunPinyin on GNU/Linux (CentOS/Redhat/Fedora).

2009-04-25T10:40:00.002+08:00

〔懒桃原创，转载请注明完整链接http://www.liulantao.com/〕= 在Linux上编译安装SUN拼音。 =Sun Pinyin是最近评价很高的一款中文输入法。首先安装必须的工具和库文件：[lax@liulantao-com ~]$ sudo yum install mercurial scim-devel libtool gcc-c++ -y如果安装过程中报错，可以添加下面的东西试试：[lax@liulantao-com ~]$ sudo yum install git gnome-common intltool -y现在把源代码从库中签出：[lax@liulantao-com ~]$ hg clone ssh://anon@hg.opensolaris.org/hg/nv-g11n/inputmethod开始安装过程，以下命令安装使得sun拼音能够在scim中被调用：

磁盘数据救援工具R-Studio

2009-04-21T13:11:00.001+08:00

R-Studio 是一个功能强大、节省成本的反删除和数据恢复软件系列。它采用独特的数据恢复新技术，为恢复 FAT12/16/32、NTFS、NTFS5（由 Windows 2000/XP/2003/Vista 创建或更新）、Ext2FS/Ext3FS（LINUX 文件系统）以及 UFS1/UFS2（FreeBSD/OpenBSD/NetBSD 文件系统）分区的文件提供了最为广泛的数据恢复解决方案。R-Studio 运行于本地磁盘和网络磁盘，即使这些分区已被格式化、损坏或删除。对参数进行灵活的设置，可以让您对数据恢复实施绝对控制。 R-Studio 工具恢复适合以下情况：1、没有进回收站而被直接删除的文件，或者当回收站被清空时的文件；2、因病毒攻击或电源故障被删除的文件；3、文件分区被重新格式化后的文件（甚至是不同的文件系统）；4、硬盘上的分区结构被改变或损害时的文件。在这种情况下，

Principles behind the Agile Manifesto

2009-04-15T08:09:00.000+08:00

Principles behind the Agile ManifestoWe follow these principles:Our highest priority is to satisfy the customerthrough early and continuous deliveryof valuable software. Welcome changing requirements, even late indevelopment. Agile processes harness change forthe customer's competitive advantage.Deliver working software frequently, from acouple of weeks to a couple of months, with a preference to