monitors if host is up or down

ping_test_script.sh

#!/bin/bash

echo "[`date`][Start] Host alive tester"

host_ip_addr="192.168.10.100"

alive_history=()
alive_history_size=5
while true; do
    #ping -nqc1 $host_ip_addr &> /dev/null #ping not good because cant set timeout time
    fping -t500 -c1 $host_ip_addr &> /dev/null 
    alive_or_not=$?
    alive_history=($alive_or_not ${alive_history[@]:0:$alive_history_size})
    numb_of_errors=0
    for alive_status in "${alive_history[@]}"; do
        if [ $alive_status -eq 1 ]; then
            #expr $numb_of_errors = $numb_of_errors + 1
            numb_of_errors=$((numb_of_errors + 1))
        fi
    done
    if [ $numb_of_errors -ge $alive_history_size ]; then
        echo "[`date`][dead] Host $host_ip_addr is down"
        beep
        espeak "Host $host_ip_addr is down. Do something, fast!"
    #else
    #    echo "[`date`][alive]"
    fi
    #echo "error count:" $numb_of_errors " array content: " ${alive_history[@]}
    sleep 1
done