インターネットへの到達性を定期的に監視して、状態が変わるとしゃべる

netcheck.sh

#!/bin/sh

while true
do
    ping -t 6 -i 2 www.google.com 1>/dev/null 2>/dev/null
    if [ $? -ne 0 ]
    then
        echo "Network Has Gone"
        if [ `cat ~/.netcheck.last` = "OK" ]
        then
            say "Network Has Gone"
        fi
        echo "Error" > ~/.netcheck.last
        sleep 6
    else
        echo "Network Has Come"
        if [ `cat ~/.netcheck.last` = "Error" ]
        then
            say "Network Has Come"
        fi
        echo "OK" > ~/.netcheck.last
    fi
done