Simple program to parse output from /proc/net/dev, and show internet download speed
./monitor
-f file to save output
-s show output
-d delay
-h show help
eg this will printout and save (and update) a file XYZ
./monitor.sh -s -f XYZ
edit /etc/i3status.conf
order += "read_file band"
[...]
read_file band{
path = "path/to/output/file"
}
add to the .config/i3/status
exec bash /path/to/monitor.sh -f /path/to/output/file