[until bash command] An example on how to use the until command on bash to check when connectivity is back #linux #macosx #syadmin

until_command.md

Example: ping google.com until it becomes reachable (for testing when internet connection is back), then notify with an audio message

until ping -W1 -c1 google.com; do sleep 5; done && say connected

It's also possible to use different notification means (e.g., notify-send on Ubuntu, growl on Mac, pushover, etc.).

Notes on ping:

ping -W1 -c1 google.com

means ping just once (-c1) and wait for reply for 1 second (-W1). It returns 0 if host is reachable, error otherwise.