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#http://ruby-hacking-guide.github.io/minimum.html

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Man-pages translation (Korean) http://www.joinc.co.kr/modules/moniwiki/wiki.php/man/
Linux Container http://lxc.sourceforge.net/

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-hashbangs:
  shell annotation that defines what to excute or compile, located at top.
  example: #!/bin/bash

-Shell builtin commands. ($ man builtin)
- do done loop
do
  case $opt in
    "opt 1"
    

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/*#Regexp syntax:

  /  match  /  options /
  ^         ^
 
  start of match: ^
  end of match: $
  wrap: ( )
  range: [0-9] = \d
         [01] = 0 or 1

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//using String.split to split and assign Object

function splitCurrentURL(){
  //query given index.html?this=true&that=good;
  var url = location.href.split("?")[1]; // this=true&that=good;
  params = {}; //init param obj
  url = url.split("&"); // ['this=true','that=good']
  for(var i = 0; i<url.length; i++){

    var split_cache = url[i].split("="); // ['this','true'], ...

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function reverseString(string){

	var length = string.length;
	var output = '';

	for(var i=1;i<=length;i++){
		output = output.concat(string[length-i]);
		console.dir(output)
	}
	return output;

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function add(a,b){ return a + b;}
add(1)  //returns NaN

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//extract substring from a string.
String.prototype.substring([starting index], [end index])

//strip string before the index
String.prototype.substring([index])

//get index of string, if search doesn't exist in string then return -1
String.prototype.indexOf([search])

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Popular Structures

List

Linked List: Linked list is a dynamic data structure whose length can be increased or decreased at run time.

How Linked lists are different from arrays? Consider the following points :

An array is a static data structure. This means the length of array cannot be altered at run time. While, a linked list is a dynamic data structure. In an array, all the elements are kept at consecutive memory locations while in a linked list the elements (or nodes) may be kept at any location but still connected to each other.

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//convert array-like object into array:
//ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions_and_function_scope/arguments

//local variable 'arguments' can be converted into array using Array.prototype.slice.call(arguments)
function getArrayofArgs(){
  var args = Array.prototype.slice.call(arguments)
  return args;
}