Script to use scroll lock led as network indicator for wlan0

setScrollLedOnNetworkActivity.sh

#!/bin/bash

# Check interval seconds
CHECKINTERVAL=0.1

# console
CONSOLE=/dev/console

#indicator to use [caps, num, scroll]
INDICATOR=scroll

getNet() {
  ifconfig wlan0 | egrep "RX bytes"
}
getVmstat() {
  cat /proc/vmstat|egrep "pgpgin|pgpgout"
}
#turn led on
function led_on()
{
    #setleds -L +${INDICATOR} < ${CONSOLE}
    xset led 3
}
#turn led off
function led_off()
{
    #setleds -L -${INDICATOR} < ${CONSOLE}
    xset -led 3
}
# initialise variables
NEW=$(getNet)
OLD=$(getNet)
## 
while [ 1 ] ; do
  sleep $CHECKINTERVAL # slowdown a bit
  # get status 
  NEW=$(getNet)
  #compare state
  if [ "$NEW" = "$OLD" ]; then  
    led_off ## no change, led off
  else
    led_on  ## change, led on
  fi
  OLD=$NEW  
done