nload是非常好用的工具，在centOS7上嘗試使用。
一、安裝
從https://dl.fedoraproject.org/pub/epel/下載文件epel-release-latest-7.noarch.rpm
安裝：
# rpm -ivh epel-release-latest-7.noarch.rpm
安裝nload
# yum install nload
二、試用：
查看幫助
nload -h
# nload -h
nload version 0.7.4
Copyright (C) 2001 - 2012 by Roland Riegel <[email protected]>
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.
顯示多個設備的流量：
nload -m
