Online and RTT check | Bash

gistfile1.txt

#!/bin/bash

#
# Internet connection check and take note
# of the roundtrip time to specified host.
#
# For use on a panel.
#

HOST="4.2.2.2"
TODAY=$(date +%Y-%m-%d/%H:%M:%S)
LOGFILE="$HOME/.internet_connectivity.log"


function _exit () {
    echo "Online check disabled" > $HOME/.online_check
}

# Execute at script end.
trap "_exit" 0


# Main

while [ 1 ]
do
    rtt=$(ping $HOST -w 3 -c 1 | sed -rn 's/.*time=([0-9]{1,})\.?[0-9]{0,} ms.*/\1/p')
    onlineStatus=$(ping -c 1 -q google.com >&/dev/null; echo $?)

    if [ "$onlineStatus" -eq 0 ]; then
        echo "Online ($rtt ms)" > $HOME/.online_check
        # echo "$TODAY Online" >> "$LOGFILE"
    else
        echo "Offline" > $HOME/.online_check
        echo "$TODAY Offline" >> "$LOGFILE"
    fi

    sleep 5s
done