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Following examples show the cases. % ktrace -f - false >/dev/null && echo wrong wrong % ktrace -f - -i /usr/sbin/update >/dev/null (does not return to command line) That is, back out last change and restore the roles of parent/child for ktrace(1). The ktruss(1) stuff still remains. Yes, ktruss(1) has the problems. Better implementation is expected.