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+This script retrieves the certificate of the site you target:
+<file>
+#!/bin/sh
+#
+# usage: retrieve-cert.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'
+</file>
+This script checks a list of sites for their expire date:
+<file>
+#!/bin/sh
+#
+for CERT in \
+  www.yourdomain.com:443 \
+  ldap.yourdomain.com:636 \
+  imap.yourdomain.com:993 \
+do
+  echo |\
+  openssl s_client -connect ${CERT} 2>/dev/null |\
+  sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' |\
+  openssl x509 -noout -subject -dates
+done
+</file>