centos 離線安裝 nc (netcat)

首先須要下載安裝包： 地址：這是64位的web http://vault.centos.org/6.6/os/x86_64/Packages/nc-1.84-22.el6.x86_64.rpm 32位centos http://vault.centos.org/6.6/os/i386/Packages/nc-1.84-22.el6.i686.rpm 執行命令：install the package

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