Checks improved

definitions/default/check/all/system_timezone_is_berlin.check.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+_CURRENT_FILE='/etc/timezone'
+
+#The file must be readable, then
+#the number of lines containing "Europe/Berlin" must be one.
+[ -r "${_CURRENT_FILE}" ] \
+    && [ "1" == "$(cat "${_CURRENT_FILE}" | grep 'Europe/Berlin' | grep -c .)" ] \
+    && exit 0
+exit 1