Guangyang Li gyli

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

Toggle MacOS X Notification Center on or off

This gist is to remind me (and anyone else who it helps) how to quickly disable and re-enable Notification Center.

Set Up Bash Aliases

Installation

Open your terminal (<⌘ + ␣ (spacebar)>, then type "terminal", then press <↩ (enter)>).

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname


	import com.github.fge.jsonschema.core.report.ProcessingMessage

	import scala.collection.JavaConversions._

	import com.fasterxml.jackson.databind.JsonNode
	import com.github.fge.jsonschema.main.JsonSchemaFactory

	import org.json4s._
	import org.json4s.jackson.JsonMethods._

	/*
	Notes:

	Despite Scala's appearances, it is, in fact, a Statically Typed language.
	It has just eliminated a great deal of the "type vomit" people are used
	to seeing in Statically Typed languages (e.g. C, C++, Java). It often
	can infer the type on its own. It also combines functional and
	object-oriented programming paradigms in a fashion that feels similar
	to Python.
	*/

	"""
	Convert a MongoDB ObjectID to a version-1 UUID.

	Python 2.7+ required for datetime.timedelta.total_seconds().

	ObjectID:
	- UNIX timestamp (32 bits)
	- Machine identifier (24 bits)
	- Process ID (16 bits)
	- Counter (24 bits)