Mine
public text v1 · immutable/sbin/ifconfig eth0 | awk '/RX bytes/{print $2 > "/tmp/rxbytes"}' FS="[:(]"
/sbin/ifconfig eth0 | awk '/TX bytes/{print $4 > "/tmp/txbytes"}' FS="[:(]"
sleep 2
lcd-write `/sbin/ifconfig eth0 | awk 'BEGIN{getline earlier < "/tmp/rxbytes"} /RX bytes/{print "RX:"($2-earlier)/(1024*2)" KB/s"}' FS="[:(]" | cut -c -8` `/sbin/ifconfig eth0 | awk 'BEGIN{getline earlier < "/tmp/txbytes"} /TX bytes/{print "TX:"($4-earlier)/(1024*2)" KB/s"}' FS="[:(]" | cut -c -8`