前言：没有特殊原因，文档如果要传到linux上，一定要打成*.zip格式，
这样方便解压，一般来说没有理由要用rar.关于 linux上unzip命令有空细讲，
本节讲下，如何让linux支持解压缩rar文件
一 、系统环境
1.1 系统环境
实验环境一：
CentOS release 5.5 (Final)
2.6.18-194.el5
x86_64 GNU/Linux <--64位系统
实验环境二：
CentOS release 5.4 (Final)
2.6.18-164.el5
i686 GNU/Linux <--32位系统
1.2命令查看方法：
[root@oldboy tools]# cat /etc/redhat-release
CentOS release 5.5 (Final)
[root@oldboy tools]# uname -r
2.6.18-194.el5
[root@oldboy tools]# uname -m
x86_64
二、下载并安装rar软件
2.1 下载
mkdir -p /home/oldboy/tools
cd /home/oldboy/tools
wget http://www.rarlab.com/rar/rarlinux-3.8.0.tar.gz
2.2 安装
tar zxvf rarlinux-3.8.0.tar.gz
cd rar
make
make install
三、rar命令语法
将/etc 目录压缩为etc.rar 命令为：
rar a etc.rar /etc
将etc.rar 解压 命令为：
rar x etc.rar
unrar -e etc.tar
四、具体例子
实例：将/etc 目录压缩为etc.rar
[root@oldboy tools]# rar a etc.rar /etc
RAR 3.80 Copyright (c) 1993-2008 Alexander Roshal 16 Sep 2008
Shareware version Type RAR -? for help
Evaluation copy. Please register.
Creating archive etc.rar
Adding /etc/gdm/securitytokens.conf OK
Adding /etc/gdm/Init/Default OK
Adding /etc/gdm/custom.conf OK
Adding /etc/gdm/Xsession OK
Adding /etc/gdm/PostSession/Default OK
Adding /etc/gdm/PreSession/Default OK
Adding /etc/gdm/XKeepsCrashing OK
Adding /etc/gdm/locale.alias OK
Adding /etc/gdm/PostLogin/Default.sample OK
省略若干行......
查看
[root@oldboy tools]# ll
总计 26704
-rw-r--r-- 1 root root 26505645 08-20 20:26 etc.rar
将etc.rar 解压：
[root@oldboy tools]# rar x etc.rar
RAR 3.80 Copyright (c) 1993-2008 Alexander Roshal 16 Sep 2008
Shareware version Type RAR -? for help
Extracting from etc.rar
Creating etc OK
Creating etc/gdm OK
Extracting etc/gdm/securitytokens.conf OK
Creating etc/gdm/Init OK
Extracting etc/gdm/Init/Default OK
Extracting etc/gdm/custom.conf OK
Extracting etc/gdm/Xsession OK
Creating etc/gdm/PostSession OK
Extracting etc/gdm/PostSession/Default OK
省略若干行......
五、更多命令 查看帮助
[root@oldboy rar]# rar
[root@ha-1-1 rar]# unrar