linux网络流量实时监控工具之nload

Install nload on a CentOS/RHEL/Red Hat/Fedora Linux

First, turn on EPEL repo on a CentOS or RHEL based system. Type the following yum command to install nload:
# yum install nload

Install nload on a Debian or Ubuntu Linux

Type the following apt-get command:
$ sudo apt-get install nload

How do I use nload to display the current network usage?

The basic syntax is:
nload nload device nload [options] device1 device2
Just type the following command:
$ nload $ nload eth0 $ nload em0 em2

Controlling nload app

Once nload command executed, it begins to monitor the network devices. You can control nload with the following key shortcuts:

You can switch between the devices by pressing the left and right arrow keys or Enter/Tab key.
Press F2 to show the option window
Press F5 to save current settings to the user’s config file.
Press F6 reload settings from the config files.
Press q or hit Ctrl+C to quit nload.

Setting the refresh interval of the display

The default value of interval is 100 milliseconds to refresh interval of the display. In this example, change to 500 milliseconds:
$ nload -t {interval_number_in_millisec} $ nload -t 500

Setting the type of unit used for the display of traffic numbers

The syntax is:
$ nload -u h|H|b|B|k|K|m|M|g|G $ nload -U h|H|b|B|k|K|m|M|g|G $ nload -u h $ nload -u G $ nload -U G
Where,

The lower case -u option: h means human readable (auto), b Bit/s, k kBit/s, m MBit/s and g GBit/s. The upper case letters mean the corresponding units in Bytes (instead of Bits). The default is k.
The upper case -U option is same as lower case -u option, but for an amount of data, e.g. Bit, kByte, GBit etc. (without "/s"). The default is M.
- REF:
- https://www.cyberciti.biz/networking/nload-linux-command-to-monitor-network-traffic-bandwidth-usage/