Check multiple hosts to see if they are reachable

pings.sh

#!/usr/bin/env bash

# Verifies that a hosts.txt file exists
# This file should contain a list of IP to pinged
if [[ ! -e ./hosts.txt ]]; then
    echo "Error: The file hosts.txt doesn't exists in this directory." >&2
    exit 1
fi

TIMESTAMP=$(date -u +%FT%T)
EXIT_STATUS=0

# Print header
echo -e "Date\t\t\tHost\t\tStatus"

for HOST in $(cat ./hosts.txt)
do
    # Ping each ip in the hosts.txt file
    ping -c 1 ${HOST} -t 3 &> /dev/null
    if [[ $? -eq 0 ]]; then
        echo -e "${TIMESTAMP}\t${HOST}\tOK"
    else
        echo -e "${TIMESTAMP}\t${HOST}\tFAIL"
        EXIT_STATUS=1
    fi
done
exit ${EXIT_STATUS}