Index: etc/crontab
===================================================================
--- etc/crontab	(wersja 204363)
+++ etc/crontab	(kopia robocza)
@@ -22,4 +22,4 @@
 #
 # Adjust the time zone if the CMOS clock keeps local time, as opposed to
 # UTC time.  See adjkerntz(8) for details.
-1,31	0-5	*	*	*	root	adjkerntz -a
+1,31	0-5	*	*	*	root	[ `sysctl -n security.jail.jailed` -eq 0 ] && adjkerntz -a