Al Chou HotFusionMan

Use a version control system that allows you to deploy exactly what you want to, not "everything up to and including a particular checkin", e.g., use Git, not Perforce.
Have a centralized admin user account on servers, but also have individual user accounts and make people log in using their individual and then sudo. This strategy provides a better audit trail than logging in directly to the cetnral admin account.
Don't build a job queue system from scratch using cron. There are so many better-behaved job queue systems in various languages.
- Cron can't schedule more than some maximum number of jobs in a single minute, so it may miss running some jobs.
- Cron can't re-run missed jobs, so you have to come up with a way yourself of identifying any missed jobs (either because of the above issue or because cron or the system was down) and running them.
Databases sometimes need to be versioned in ways besides ActiveRecord-type migrations. For example, if two code branches differ in the columns th

	module PerfectBitsMath
	def number_of_squares_in_interval( m, n )
	1
	end
	end

	module Math
	extend PerfectBitsMath
	end

	# Based on http://stackoverflow.com/questions/2339021/how-can-i-load-some-activerecord-models-from-a-yaml-file-and-save-them-to-the-db/

	seed_filepath = File.join( RAILS_ROOT, 'db', 'seeds.yaml' )
	config = YAML::load_file( seed_filepath )

	config.each { \|pluralized_model_name, fixtures\|
	model_class = pluralized_model_name.singularize.constantize

	# If you like leaping without looking:
	# model_class.create( fixtures )

	now = Time.now.to_a

	if ( now[2] * 60 + now[1] ) * 60 + now[0] > START_TIME_IN_SECONDS then
	# start whatever you wanted to start at this time
	end

	#!/usr/bin/env ruby

	require 'rexml/document'

	def set_up_Growl
	if `ps -ax \| grep GrowlHelperApp\.app \| grep -v grep` == '' then
	system( 'open /Library/PreferencePanes/Growl.prefPane/Contents/Resources/GrowlHelperApp.app' )
	end
	end

	import java.lang.reflect.Method ;

	String className = "java.lang.Class" ; // or whatever class you're interested in

	Class c = Class.forName( className ) ;

	Method[] methods = c.getDeclaredMethods() ;

	for ( Method m : methods )
	{

	cd /Library/Preferences/SystemConfiguration
	sudo rm com.apple.airport.preferences.plist com.apple.network.identification.plist
	cd ~/Library/Preferences
	rm com.apple.internetconfigpriv.plist com.apple.internetconfig.plist

	test_type=unit
	test_class_name=active_record

	rake test:${test_type}s TEST=test/${test_type}/${test_class_name}_test.rb