个人觉得nload是个很好用的轻量级Linux网络流量实时监控工具，功能也很强.安装软件后，输入命令nload后，nload软件会很直观的显示流量的即时状态，上半部分ncoming是进入网卡的流量，下半部分Outgoing是从这块网卡出去的流量，每部分都有当前流量（Curr）、平均流量（Avg）、最小流量（Min）、最大流量（Max）、总流量（Ttl）。nload的工作界面如下所示：

官网及下载：http://www.roland-riegel.de/nload/index.html
http://www.roland-riegel.de/nload/nload-0.7.4.tar.gz

源码包方式安装：
wget http://www.roland-riegel.de/nload/nload-0.7.4.tar.gz
tar -zxvf nload-0.7.4.tar.gz
cd nload-0.7.4
./configure;make;make install

yum方式安装：
yum install -y nload

使用：
直接输入nload回车即可，也可以指定网卡，如nload eth1，还可以指定是以K、M和G来显示流量，如nload -u M显示的流量是以MB为单位的，nload -u G显示的流量是以GB为单位的。

查看还有哪些参数或选项：
[root@wdlinux ~]# nload -h

nload version 0.7.4
Copyright (C) 2001 – 2012 by Roland Riegel
nload comes with ABSOLUTELY NO WARRANTY. This is free software, and you are
welcome to redistribute it under certain conditions. For more details see the
GNU General Public License Version 2 (http://www.gnu.org/copyleft/gpl.html).

Command line syntax:
nload [options] [devices]
nload –help|-h

Options:
-a period Sets the length in seconds of the time window for average
calculation.
Default is 300.
-i max_scaling Specifies the 100% mark in kBit/s of the graph indicating the
incoming bandwidth usage. Ignored if max_scaling is 0 or the
switch -m is given.
Default is 10240.
-m Show multiple devices at a time; no traffic graphs.
-o max_scaling Same as -i but for the graph indicating the outgoing bandwidth
usage.
Default is 10240.
-t interval Determines the refresh interval of the display in milliseconds.
Default is 500.
-u h|b|k|m|g Sets the type of unit used for the display of traffic numbers.
H|B|K|M|G h: auto, b: Bit/s, k: kBit/s, m: MBit/s etc.
H: auto, B: Byte/s, K: kByte/s, M: MByte/s etc.
Default is h.
-U h|b|k|m|g Same as -u, but for a total amount of data (without “/s”).
H|B|K|M|G Default is H.
devices Network devices to use.
Default is to use all auto-detected devices.
–help
-h Print this help.

example: nload -t 200 -i 1024 -o 128 -U M

The options above can also be changed at run time by pressing the ‘F2′ key.

FAQ
如安装时提示下面的问题
configure: error: ncurses library or development files not found. ncurses is required for nload.
make: *** No targets specified and no makefile found. Stop.
make: *** No rule to make target `install’. Stop.

用 yum install -y ncurses-devel 即可解决

原文地址：http://www.pconto.com/nload.shtml