ASAP: Create a bash script to act as a watchdog ran via cron

I need a bash script which can be ran every minute from cron. The bash script must perform the following exactly. **check ifconfig to see if the interface tun0 exists: if not, run 'systemctl stop openvpn; sleep 1; systemctl start openvpn when fixed, send an email using ssmtp to every email address in /root/[login to view URL] **check if tun0 has an ip address: if not, run 'systemctl stop openvpn; sleep 1; systemctl start openvpn when fixed, send an email using ssmtp to every email address in /root/[login to view URL] **check if tun0 is down: if yes, run 'systemctl stop openvpn; sleep 1; systemctl start openvpn when fixed, send an email using ssmtp to every email address in /root/[login to view URL] **check if openvpn is running: if not, run 'systemctl stop openvpn; sleep 1; systemctl start openvpn when fixed, send an email using ssmtp to every email address in /root/[login to view URL] **check if tun0 ip address is the same as /root/[login to view URL] if not, send an email using ssmtp to every email address in /root/[login to view URL] with the new tun0 ip address and update the ip address in /root/[login to view URL]