Multi-host Ping Monitoring

pingmon

#!/bin/bash

set -o pipefail

IPS=( "$@" )
MAX=$(( $( tput lines ) - 3 )) ## Heading + 1 = 3
test ${MAX} -lt 10 && MAX=10

function print_row( ) {
    printf "| "
    printf "%20s |" "${@}"
    echo ""
}

for (( loop = 0; ; ++loop )); do
    PING_HISTORY_0=( "$( date +%j-%H%M%S.%N )" ${PING_HISTORY_0[@]:0:${MAX}-1} )
    
    for (( i = 1; i <= ${#IPS[@]}; ++i )); do
        val=$( ping -W 0.2 -c 1 ${IPS[$i-1]} | sed '/bytes from/!d;s, ,,g;s,.*time=,,g' )
        
        case $? in
            0)  ;;
            1) val="TIMEOUT"; ;;
	    *) val="ERROR"; ;;
        esac
        
        eval PING_HISTORY_$i=\( "$val" "\${PING_HISTORY_$i[@]:0:${MAX}-1}" \)
    done

    clear

    print_row "" ${IPS[@]}
    print_row "-" ${IPS[@]/*/-}

    for (( n = 0; n < ${#PING_HISTORY_0[@]}; ++n )); do
        print_row $(
            for (( i = 0; i <= ${#IPS[@]}; ++i )); do
                eval echo "\${PING_HISTORY_$i[$n]}"
            done
        )
    done
    
    sleep 0.2
done