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
===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/