root@turris:~# cat sh/led_status.sh
#!/bin/sh

DEFAULT_COLOR=`cat /etc/config/rainbow | grep color | cut -d " " -f 3 | tr -d "\'"`
LOAD=`cat /proc/loadavg | cut -d ' ' -f 2`
MEM=`free | awk '/^Mem:/{print $4}'`

if [ $(echo "$LOAD > 1" | bc) -ne 0 ] || [ $(echo "$MEM < 30000" | bc) -ne 0 ]; then
        if [ $(echo "$LOAD > 2" | bc) -ne 0 ] || [ $(echo "$MEM < 10000" | bc) -ne 0 ]; then
                rainbow pwr red enable
                {
                        echo To: mail@kolaczek.cz
                        echo From: turris@kolaczek.cz
                        echo Subject: Resources are RED!
                        echo
                        echo Load: $LOAD
                        echo Free memory: $MEM kb
                 } | ssmtp mail@kolaczek.cz
        else
                rainbow pwr FFFF00 enable
        fi
else
        rainbow pwr $DEFAULT_COLOR enable
fi

if ping -c 1 -w 3 8.8.8.8
then
        rainbow wan $DEFAULT_COLOR auto
else
        rainbow wan red auto
fi

if ping -c 1 -w 3 192.168.0.2
then
        rainbow usr1 $DEFAULT_COLOR enable
else
        rainbow usr1 red enable
fi

if ping -c 1 -w 3 192.168.0.3
then
        rainbow usr2 $DEFAULT_COLOR enable
else
        rainbow usr2 red enable
fi

exit 0