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/usr/share/ofono/scripts/send-ussd is in ofono-scripts 1.21-1ubuntu1.

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The actual contents of the file can be viewed below.

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#!/usr/bin/python3

import sys
import dbus

if (len(sys.argv) < 2):
	print("Usage: %s [modem] <ussd-string>" % (sys.argv[0]))
	sys.exit(1)

bus = dbus.SystemBus()

manager = dbus.Interface(bus.get_object('org.ofono', '/'),
						'org.ofono.Manager')

modems = manager.GetModems()

if (len(sys.argv) == 2):
	path = modems[0][0]
	ussdstring = sys.argv[1]
else:
	path = sys.argv[1]
	ussdstring = sys.argv[2]

ussd = dbus.Interface(bus.get_object('org.ofono', path),
					'org.ofono.SupplementaryServices')

properties = ussd.GetProperties()
state = properties["State"]

print("State: %s" % (state))

if state == "idle":
	result = ussd.Initiate(ussdstring, timeout=100)
	print(result[0] + ": " + result[1])
elif state == "user-response":
	print(ussd.Respond(ussdstring, timeout=100))
else:
	sys.exit(1);

properties = ussd.GetProperties()
state = properties["State"]

if state == "idle":
	sys.exit(0)

print("State: %s" % (state))

while state == "user-response":
	response = input("Enter response: ")

	print(ussd.Respond(response, timeout=100))

	properties = ussd.GetProperties()
	state = properties["State"]

	if state != "idle":
		print("State: %s" % (state))