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	#!/usr/bin/env python3

	# Delete "set service dhcp-relay relay-options port" option
	# Delete "set service dhcpv6-relay listen-port" option

	import sys

	from vyos.configtree import ConfigTree

	if (len(sys.argv) < 1):
	print("Must specify file name!")
	sys.exit(1)

	file_name = sys.argv[1]

	with open(file_name, 'r') as f:
	config_file = f.read()

	config = ConfigTree(config_file)

	if not (config.exists(['service', 'dhcp-relay', 'relay-options', 'port']) or config.exists(['service', 'dhcpv6-relay', 'listen-port'])):
	# Nothing to do
	sys.exit(0)
	else:
	# Delete abandoned node
	config.delete(['service', 'dhcp-relay', 'relay-options', 'port'])
	# Delete abandoned node
	config.delete(['service', 'dhcpv6-relay', 'listen-port'])

	try:
	with open(file_name, 'w') as f:
	f.write(config.to_string())
	except OSError as e:
	print("Failed to save the modified config: {}".format(e))
	sys.exit(1)