/usr/share/ofono/scripts/set-context-property is in ofono-scripts 1.12.bzr6858+14.04.20140318-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | #!/usr/bin/python
import sys
import dbus
if len(sys.argv) < 4:
	print("Usage: set-context-property <context> <name> <value>")
	sys.exit(1)
bus = dbus.SystemBus()
manager = dbus.Interface(bus.get_object('org.ofono', '/'),
						'org.ofono.Manager')
modems = manager.GetModems()
for path, properties in modems:
	if "org.ofono.ConnectionManager" not in properties["Interfaces"]:
		continue
	connman = dbus.Interface(bus.get_object('org.ofono', path),
					'org.ofono.ConnectionManager')
	contexts = connman.GetContexts()
	if (len(contexts) == 0):
		print("No context available")
		sys.exit(1)
	path = contexts[int(sys.argv[1])][0]
	context = dbus.Interface(bus.get_object('org.ofono', path),
					'org.ofono.ConnectionContext')
	try:
		context.SetProperty(sys.argv[2], sys.argv[3])
	except dbus.DBusException as e:
		print("Error setting context %s property %s: %s" %\
				(path, sys.argv[2], str(e)))
		exit(2)
 |