未安装wget，联网只要yum install wget 就安装好； 


1.断点续传，只需要添加-c 参数即可 


wget -c http://mirrors.163.com/ubuntu-releases/9.10/ubuntu-9.10-desktop-amd64.iso

2.限速下载，只需要添加–limit-rate=300k合理参数即可 


wget -c --limit-rate=300k http://mirrors.163.com/ubuntu-releases/9.10/ubuntu-9.10-desktop-amd64.iso

[2019-02-14 20:46]