inux使用iftop命令进行带宽使用查看
1.首先安装所需要的依赖包

CENTOS上安装所需依赖包

yum install flex byacc  libpcap ncurses ncurses-devel libpcap-devel

Debian上安装所需依赖包：

apt-get install flex byacc  libpcap0.8 libncurses5

2.下载iftop

wget http://www.landui.com/pdw/iftop/download/iftop-0.17.tar.gz

tar zxvf iftop-0.17.tar.gz

cd iftop-0.17

./configure

make && make install