GTFS mirroring tool. This allows us to keep the GTFS data from Wellington Metlink in a revision control system (so we could look up historical data).
It should be trivial to adapt this to monitor another public transit system.
This is best used in a daily crontab.
You shouldn't need to run this script yourself though, I already provide a repository at https://github.com/gtfsdata/wellington-gtfs. It has data starting from January 2015.
Copyright 2011,2015 Michael Farrell http://micolous.id.au
This program is free software. It comes without any warranty, to the extent permitted by applicable law. You can redistribute it and/or modify it under the terms of the Do What The Fuck You Want To Public License, Version 2, as published by Sam Hocevar. See http://sam.zoy.org/wtfpl/COPYING for more details.
The data provided (in the gtfs folder) is licensed under the terms
described in data_license.txt.
A current version of the data held in this repository is available for free from Wellington Metlink's website.