Drush

unix command line tool for Drupal
assumes CLI version of php
not actually drupal php module, independant php script

when running from site directory or site root parameter set, gets drupal specific options

options
	root
	uri
	verbose
	quiet
	yes
		answer 'yes' to all prompts
	simulate
		don't actually carry out actions
	include
		include list of paths to search for drups commands
	user
		log in as a specific drupal user
	backend
		hide all output and return structured data; have scripts call drush and handle returned data

commands (
	cron
		run all cron hooks
	status
	script
		run arbitrary php scripts
	cache clear
	dl
		download latest core or module
		takes handler option to use cvs checkout instead of wget (default) 
	install
		module management
	enable
		ibid
	disable
		ibid
	status modules
	refresh
		update status info
	info 
		release info for a module
	sync
		rsync the drupal tree to/from another server
	eval
		like script
	....
	help
		takes command as parameter
		shows usage for the passed command

settings allow it to commit to local svn automatically when packages are updated
devel and coder modules both ship with drush commands, other modules encouraged to add them
	example.drush.inc show how to implement command; uses hook_drush_command()
	can specify dependencies in hook
simpletest integration removed from drush, part of simpletest module in d6 and core in D7