Vu Bao Nhu vunb

First Method

Deleting the .git folder may cause problems in our git repository. If we want to delete all of our commits history, but keep the code in its current state, try this:

# Check out to a temporary branch:
git checkout --orphan TEMP_BRANCH

# Add all the files:
git add -A

$ git checkout --orphan NEWBRANCH
$ git rm -rf .

--orphan creates a new branch, but it starts without any commit. After running the above command you are on a new branch "NEWBRANCH", and the first commit you create from this state will start a new history without any ancestry.

You can then start adding files and commit them and they will live in their own branch. If you take a look at the log, you will see that it is isolated from the original log.

Deploying a subfolder to GitHub Pages

Sometimes you want to have a subdirectory on the master branch be the root directory of a repository’s gh-pages branch. This is useful for things like sites developed with Yeoman, or if you have a Jekyll site contained in the master branch alongside the rest of your code.

For the sake of this example, let’s pretend the subfolder containing your site is named dist.

Step 1

Remove the dist directory from the project’s .gitignore file (it’s ignored by default by Yeoman).

Installing gcc 4.8 and Linuxbrew on CentOS 6

The GCC distributed with CentOS 6 is 4.4.7, which is pretty outdated. I'd like to use gcc 4.8+. Also, when trying to install Linuxbrew you run into a dependency loop where Homebrew's gcc depends on zlib, which depends on gcc. Here's how I solved the problem.

Note: Requires sudo privileges.

Resources:

http://superuser.com/a/676337/88393: Forum response on using CERN's open Scientific Linux distribution of RHEL's developer toolset.
http://linux.web.cern.ch/linux/devtoolset/: CERN's developer toolset installation instructions.

	var parser = document.createElement('a');
	parser.href = "http://example.com:3000/pathname/?search=test#hash";

	parser.protocol; // => "http:"
	parser.hostname; // => "example.com"
	parser.port; // => "3000"
	parser.pathname; // => "/pathname/"
	parser.search; // => "?search=test"
	parser.hash; // => "#hash"
	parser.host; // => "example.com:3000"

	// FROM: http://www.mongodb.org/display/DOCS/Updating#Updating-update%28%29
	//
	// db.collection.update( criteria, objNew, upsert, multi )
	// criteria - query which selects the record to update;
	// objNew - updated object or $ operators (e.g., $inc) which manipulate the object
	// upsert - if this should be an "upsert"; that is, if the record does not exist, insert it
	// multi - if all documents matching criteria should be updated
	//
	// SQL VERSION:
	// UPDATE myTable SET dateField = '2011-01-01' WHERE condField = 'condValue'

	import sys
	try:
	import simplejson as json
	except ImportError:
	import json
	try:
	import cPickle as pickle
	except ImportError:
	import pickle

	// An `Object.observe()` "polyfill" using ES6 Proxies.
	//
	// Current `Object.observe()` polyfills [1] rely on polling
	// to watch for property changes. Proxies can do one better by
	// observing property changes to an object without the need for
	// polling.
	//
	// Known limitations of this technique:
	// 1. the call signature of `Object.observe()` will return the proxy
	// object. The original object needs to be overwritten with this return value.

	# Create your superuser
	$ mongo
	> use admin
	> db.createUser({user:"someadmin",pwd:"secret", roles:[{role:"root",db:"admin"}]})
	> exit

	# Alias for convenience (optional and at your own risk)
	$ echo 'alias mongo="mongo --port 27017 -u someadmin -p secret --authenticationDatabase admin"' >> ~/.bash_profile
	$ source ~/.bash_profile

	// set-up a connection between the client and the server
	var socket = io.connect();

	// let's assume that the client page, once rendered, knows what room it wants to join
	var room = "abc123";

	socket.on('connect', function() {
	// Connected, let's sign-up for to receive messages for this room
	socket.emit('room', room);
	});