Mao yumao5

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)

In Ruby, a Symbol is the most efficient way, in terms of time and memory, to represent a set of characters.

Most commonly, a Symbol is a single word prefixed by a colon:

:hello

A Hash is a collection of key-value pairs. To add, fetch, modify, and delete a value from a Hash, you refer to it with a unique key.

While an Array is indexed by Integers only, a Hash is keyed by any object -- Strings, Integers, etc.

In other programming languages, a Hash might be known as an 'associative array', 'dictionary', or 'HashMap'.

	#!/bin/sh
	#
	# An example hook script to verify what is about to be committed.
	# Called by "git commit" with no arguments. The hook should
	# exit with non-zero status after issuing an appropriate message if
	# it wants to stop the commit.
	#
	# Usage:
	# Remove the .sh file extension when you put the script in your hooks folder!
	#

	##
	# This provides `create_enum` and `drop_enum` methods for migrations, which creates
	# a Postgres ENUM type with the provided values.
	#
	# It'll also dump these into the schema.rb to be loaded into another DB (e.g. rake db:test:load)
	#
	# In order to reference the new enums as actual types, ActiveRecord needs to know about them, so
	# make sure they are all represented in the `types` array below
	#
	# Then you can reference them in your migrations, e.g.

	#!/bin/bash

	host=http://localhost:8080
	url=/pluginManager/installNecessaryPlugins

	# git plugin https://wiki.jenkins-ci.org/display/JENKINS/Git+Plugin
	curl -X POST -d '<jenkins><install plugin="[email protected]" /></jenkins>' --header 'Content-Type: text/xml' $host$url

	# artifactory plugin https://wiki.jenkins-ci.org/display/JENKINS/Artifactory+Plugin
	curl -X POST -d '<jenkins><install plugin="[email protected]" /></jenkins>' --header 'Content-Type: text/xml' $host$url


	# 1) Create your private key (any password will do, we remove it below)

	$ cd ~/.ssh
	$ openssl genrsa -des3 -out server.orig.key 2048


	# 2) Remove the password

	$ openssl rsa -in server.orig.key -out server.key

	# ---------------------------------------------------------------------------
	#
	# Description: This file holds all my BASH configurations and aliases
	#
	# Sections:
	# 1. Environment Configuration
	# 2. Make Terminal Better (remapping defaults and adding functionality)
	# 3. File and Folder Management
	# 4. Searching
	# 5. Process Management