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工作用电脑将会切换到ubuntu上了，记录下ubuntu常用操作。

===升级到php5.4===

For Ubuntu 11.10/12.04:
sudo add-apt-repository ppa:ondrej/php5
sudo apt-get update
sudo apt-get install php5
For Ubuntu 10.04 LTS, run the following commands (Thanks to Ivan Castellanos for the extra tip):

sudo echo "deb http://ppa.launchpad.net/ondrej/php5/ubuntu lucid main" >> /etc/apt/sources.list
sudo echo "deb-src http://ppa.launchpad.net/ondrej/php5/ubuntu lucid main" >> /etc/apt/sources.list
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E5267A6C
sudo apt-get update
sudo apt-get install php5
You can check if PHP 5.4.x is successfully installed with this command:

php5 -v

http://www.zimbio.com/Ubuntu+Linux/articles/D_AsJR2qAL6/How+Upgrade+PHP+5+4+Ubuntu

===开启ubuntu的root帐号===

$ sudo passwd root
[sudo] password for ramesh:
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

http://www.thegeekstuff.com/2009/09/ubuntu-tips-how-to-login-using-su-command-su-gives-authentication-failure-error-message/

===安装SSH连接服务===

sudo apt-get install openssh-server

https://help.ubuntu.com/10.04/serverguide/openssh-server.html

===apache卸载、nginx和php安装===

http://cc.ecjtu.net/posts/php-5-4-Nginx-ubuntu-make-install php交互命令行：http://phpsh.org/