今天在服务器上打开一个ftp地址，出现ftp: command not found
一查才知道从Centos6.0开始的ftp发生了变化.
执行ftp出现以上错误解决办法为：
进入 http://mirrors.163.com/centos/6.6/os/x86_64/Packages/ 找到ftp的rpm package的地址然后执行:
# rpm -Uvh http://mirrors.163.com/centos/6.6/os/x86_64/Packages/ftp-0.17-54.el6.x86_64.rpm