Using openssl's s_client for printing certificates information from a web site

cert-check1.sh

#!/bin/sh

[ -z "$1" ] && echo "Usage: $0 www.example.com" && exit

SERVERNAME="$1"

echo						|\
openssl s_client				\
	-showcerts				\
	-servername $SERVERNAME			\
	-connect $SERVERNAME:443 2>/dev/null	|\
openssl x509					\
	-inform pem				\
	-noout					\
	-text