Connectivity checker bash script

connectivity_checker

#!/usr/bin/env bash

# Alerts
verbal_alert() {
	say "Internet Connection is currently down"
}

display_alert() {
	# See https://code-maven.com/display-notification-from-the-mac-command-line
	osascript -e 'display notification "Internet Connection is currently down" with title "Internet Connectivity" subtitle "Google Unreachable"' 2&>/dev/null
}

# Connectivity check
# See https://unix.stackexchange.com/a/190610/229935
if ! nc -zw1 google.com 443 2&>/dev/null; then
	display_alert
	verbal_alert
fi

CONNECTIVITY_CHECKER_README.md

Connectivity Checker

Intermittently check to see if your Internet connection is up and running.

Installation

1. Create and paste the code for connectivity_checker into a corresponding file in /usr/local/bin and make sure to chmod +x /usr/local/bin/connectivity_checker
2. From your command line, type crontab -e
3. Within the crontab editor, make a new line
4. Enter */5 * * * * /usr/local/bin/connectivity_checker to check every 5 minutes