#!BOURNESHELL
#	program:	domsort
#	purpose:	Filter that sorts domain names by upper-level domain
#			first, next inner domain name next, and so on.
#	input:		FQDN domain names, one per line on stdin.
#	output:		The same domain names, sorted by domain hierarchy.
#	exit value:	0 if succeeds, 1 if usage wrong,
#			or whatever value the awk|sort|sed pipeline returns.
#

usage() {
	echo "usage: $0 [-u]" >&2
	exit 1
}

if test $# -gt 1; then
	usage
fi

u=''
for arg do
	case $arg in
		-u)	u='u' ;;
		*)	usage ;;
	esac
done

awk -f DOMLIB/domsort.awk | sort -fi$u | sed -e 's/^[^ ]* //'

exit $?
