Print SSL certificate end dates for a list of domains

cert-expiration.sh

#!/bin/sh

domains=(
  "example.org"
  "example.com:7443"
)

default_port=443

for domain in ${domains[@]}; do
  raw_domain=$(echo $domain | cut -d':' -f1)
  port=$(echo $domain | cut -d':' -s -f2); : ${port:=$default_port}


  echo $raw_domain:$port
  echo | openssl s_client -servername $raw_domain -connect $raw_domain:$port 2>/dev/null | openssl x509 -noout -enddate
  echo
done