最好用的轻量级Linux网络流量实时监控工具nload

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 <feedback@roland-riegel.de>
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