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