/usr/bin/unbound-checkconf: invalid option -- '-'
Usage:	unbound-checkconf [file]
	Checks unbound configuration file for errors.
file	if omitted /etc/unbound/unbound.conf is used.
-o option	print value of option to stdout.
-f 		output full pathname with chroot applied, eg. with -o pidfile.
-q 		quiet (suppress output on success).
-h		show this usage help.
Version 1.26.2
BSD licensed, see LICENSE in source package for details.
Report bugs to unbound-bugs@nlnetlabs.nl or https://github.com/NLnetLabs/unbound/issues