-u <url> | —url <url> argument

Now we can pass a single url as argument to be checked.

validity.sh

@@ -109,6 +109,7 @@ for host in "${hosts[@]}"; do
     	e="Date fin: $end"
 
 	else
+		echo "$host"
 		cert=`echo |
                 openssl s_client -connect $host:$port 2>/dev/null |
                 openssl x509 -issuer -subject -dates -noout`