Bash script to test if connected to a specific network and (optionally) if a given host is available on said network. Useful for cron / automated scripts.

connectedTo

#!/bin/bash -e

if [ $# -lt 1 ]; then
  echo -e "
Connection and host availability test

Usage:\n$0 'My network name' [ip_or_hostname] && command_to_run_when_available

  The network name needs to be quoted and as Network Manager reports it. Try
  'nmcli c show'.

  Optionally an IP or hostname can be checked. Three successive succesful pings
  are considered a reliable link.

Your current networks:
"
  nmcli c show
  exit 1
fi

if [ $# -gt 1 ]; then
  nmcli -t -f NAME c show --active | grep -qse "^${1}$" &&
  ping -c 3 -i 0.333 -w 2 "$2" > /dev/null
  exit $?
else
  nmcli -t -f NAME c show --active | grep -qse "^${1}$"
  exit $?
fi