rsync
由于找到了一个很好的用于备份的软件，现在也想在linux下使用。
这个软件是用java写的，所以只要现有设备支持JRE就可以用这个软件，当然手机上也可以用了。这还只说了这个软件的运行平台。软件的功能也是非常强大，不仅有各种准先定义好的备份方式，还可以按自己的需要来选择各种参数。
DirSync Pro is developed in Java and it is multi-platform. It means DirSync Pro could be run under any Operating System which has Java Runtime Environment (JRE). You can download JRE at java.com for free.
软件是绿色的，下载了windows 7 pro的版本很好用。就想也要另一台装了ubuntu11.04的电脑上也用用，可是这台电脑上java还没装好。今天又试了试，找到安装指导文档，很轻松的就装上了。
Introduction
Java is a technology from Sun Microsystems. There are several implementations, of which five will be talked about here:
Open JDK
Installation of Java Runtime Environment
Browser plugin
SDK (Software Development Kit)
Sun Java
Installation of Java Runtime Environment
Browser plugin
SDK (Software Development Kit)
Choosing the default Java to use
If on system are present different versions of Java, typing the following command in a terminal window:sudo update-alternatives --config javato choose the version that you desire.GNU Compiler for Java
Install java-gcj-compat-headless packages in any method.To install the development environment, install the java-gcj-compat-dev package.GCJ is a front end to the GCC compiler which can natively compile both Java(tm) source and bytecode files. The compiler can also generate class files. Gcjwebplugin is a little web browser plugin to execute Java applets.It is targeted for Mozilla and compatible browsers that support the NPAPI. Others include the Eclipse Java Compiler, which is maintained by the Eclipse Foundation. Eclipse is an open-source Integrated development environment (IDE) written primarily in Java. The Eclipse open source community has over 60 open source projects. OpenJDK is the open source Java, derived from sources which will become OpenJDK 7 in the future.
