Simple script to check the date of a certificate on a web site

gistfile1.txt

#!/bin/sh
#
# usage: fetch_certificate_and_check_date.sh remote.host.name [port]
#
REMHOST=$1
REMPORT=${2:-443}

echo |\
openssl s_client -connect ${REMHOST}:${REMPORT} 2>&1 |\
sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' |\
openssl x509 -noout -subject -dates