Could you help me writing a script showing which network connections are currently active?

Shell Programming and Scripting
1

Could you help me writing a script showing which network connections are currently active?
Means output should be something like:
"eth0, wlan1, wlan3"

Problem:
The output is supposed to happen on a 16x2 LCD Display.
Currently I am doing a "Ifconfig" as output, but its too fast for the display.

2

Use the below command instead of using only ifconfig, ifconfig output will be greped and filters the inet line to get only the IP address.

ifconfig | grep inet

Sample output is here.

3

quick and dirty, no error checking etc, some polishing needed:

ifconfig | awk '$1 {print $1}' FS="  " ORS=,
eth0,lo,