show SSL certificate for a given web site

ssl_cert_check.sh

#!/bin/sh

PORT=443

if [ $# -lt 1 ] || [ $# -gt 2 ]; then
    echo "Usage: $0 <domain> [<port>] (without https://)" 1>&2
    echo "  default port is $PORT" 1>&2
    exit 1
fi

host="$1"
port="${2:-$PORT}"

echo | openssl s_client -connect "$host":"$port" 2>/dev/null| openssl x509 -noout -text