APT install only security updates

Check security updates:

sudo unattended-upgrade --dry-run -d

If previous command show packages to update:

sudo apt-get -s dist-upgrade | grep "^Inst" | grep -i securi | awk -F " " {'print $2'} | xargs apt-get install

View expiration date of DNSSEC signature

  dig SOA yourdomain.com @nameserver +dnssec  

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