debian 安装 ssh

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cp  /etc/apt/sources.list  /etc/apt/sources.listbak   #备份原有配置文件 
vi  /etc/apt/sources.list   #编辑
    注释掉本地光盘源这一行： 
deb cdrom:[Debian GNU/Linux 6.0.4 _Squeeze_ - Official i386 DVD Binary-1 20120128-12:53]/ squeeze contrib main

deb http://mirrors.163.com/debian/ squeeze main non-free contrib 
deb http://mirrors.163.com/debian/ squeeze-proposed-updates main contrib non-free 
deb http://mirrors.163.com/debian-security/ squeeze/updates main contrib non-free 
deb-src http://mirrors.163.com/debian/ squeeze main non-free contrib 
deb-src http://mirrors.163.com/debian/ squeeze-proposed-updates main contrib non-free 
deb-src http://mirrors.163.com/debian-security/ squeeze/updates main contrib non-free 
deb http://ftp.sjtu.edu.cn/debian/ squeeze main non-free contrib   
deb http://ftp.sjtu.edu.cn/debian/ squeeze-proposed-updates main  contrib  non-free 
deb http://ftp.sjtu.edu.cn/debian-security/ squeeze/updates main  contrib  non-free 
deb-src http://ftp.sjtu.edu.cn/debian/ squeeze main non-free contrib 
deb-src http://ftp.sjtu.edu.cn/debian/ squeeze-proposed-updates main  contrib  non-free 
deb-src http://ftp.sjtu.edu.cn/debian-security/ squeeze/updates main  contrib  non-free 

apt-get update   #更新源 
apt-cache search ssh   #查看更新的包 
apt-get install openssh-server    #安装ssh服务
apt-get install ssh     #安装ssh