Linux Centos 5

Adicionar Repositórios

wget https://packages.sw.be/rpmforge-release/rpmforge-release-0.3.6-1.el5.rf.i386.rpm
rpm -Uvh rpmforge-release-0.3.6-1.el5.rf.i386.rpm
wget https://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm
rpm -ivh epel-release-5-3.noarch.rpm

Instalando Descompactador para extenção RAR

wget https://www.rarlab.com/rar/rarlinux-3.4.1.tar.gz
tar -xvzf rarlinux-3.4.1.tar.gz
mv rar /usr/local/
cd /usr/local/bin
ln -s /usr/local/rar/unrar