Script to send a notification on Pushbullet when a command has finished. See details in comment.

monitor.py

#!/usr/local/bin/python3

from argparse import ArgumentParser
from socket import gethostname
import subprocess

import arrow
import requests


# Usage:
# monitor ping -c 5 google.com


PUSH_KEY = 'PUSHBULLET_API_KEY'  # change me!


def main(command, params):
    begin_time = arrow.utcnow()
    push_data = {'type': 'note'}
    try:
        ret = subprocess.check_call([command] + params)
        push_data['title'] = 'La commande "%s" a terminé.' % command
    except subprocess.CalledProcessError as err:
        push_data['title'] = 'La commande "%s" a terminé avec une erreur...' % command

    duration = arrow.utcnow().humanize(begin_time, locale='fr_fr', only_distance=True)
    push_data['body'] = "Hostname : %s\nTemps d'exécution : %s" % (gethostname(), duration)
    push_headers = {'Access-Token': PUSH_KEY}
    r = requests.post('https://api.pushbullet.com/v2/pushes', data=push_data, headers=push_headers)

if __name__ == "__main__":
    parser = ArgumentParser()
    parser.add_argument('command')

    args = parser.parse_known_args()
    cmd = args[0].command
    params = args[1]
    main(cmd, params)

Place this file into your /usr/local/bin, make it executable (chmod +x monitor). Ensure that you have python3 with the modules arrow and requests (installable with pip install arrow requests).