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$ sudo apt-get install git-core etckeeper

#configure git
# edit /etc/etckeeper/etckeeper.conf

$ sudo etckeeper init
$ sudo etckeeper commit “Initial Commit”

$ cd /etc
$ sudo git status

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package pis.chap22.multimap
import scala.collection.immutable.HashMap

class LasMultiMap[A, B] {
    var mmap = new HashMap[A, List[B]]
	def put(key:A, value:B) = {
	  if (mmap.contains(key)) {
	    mmap = mmap + ( (key, mmap.get(key).toList(0) ::: List(value) ))
	  } else {
	    mmap = mmap + ( (key, List(value)) )

outsideris

watch -n 1 "COMMAND"

outsideris

$ openssl des3 -salt -in plain.txt -out encrypted.txt

outsideris

sed -n '/패턴/p' # 패턴의 라인만 출력
sed 's/패턴/치환문자/g' # 문자열 바꾸기

#정규식
\n # new line
\+ # 1개 이상
\{n\} # n개이상

outsideris

task 'epub', ->
  exec 'pandoc -S --epub-stylesheet style.css -o output/nodebook.epub ' +
    'chapters/prologue.md ' +
    'chapters/overview.md ' +
    'chapters/history.md ' +
    'chapters/installation.md ' +
    'chapters/gettingstarted.md ' +
    'chapters/tcpchat.md ' +
    'chapters/twitter.md ' +
    'chapters/npm.md ' +

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# These are my notes from the PragProg book on CoffeeScript of things that either 
# aren't in the main CS language reference or I didn't pick them up there. I wrote 
# them down before I forgot, and put it here for others but mainly as a reference for 
# myself.

# assign arguments in constructor to properties of the same name:
class Thingie
    constructor: (@name, @url) ->

# is the same as:

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// jquery
$(document).ready(function(){
});

// prototype.js
document.observe("dom:loaded", function() {
});

// vanilla javascript (it's not dom loaded)
window.onload = function() {

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script(src='/socket.io/socket.io.js')
script
  window.onload = function() {
    var socket = io.connect('/test');
    socket.on('connect', function() {
      console.log('connected'); 
      socket.emit('mock', 'test message');
    });

    socket.on('mock', function(msg) {

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script(src='/socket.io/socket.io.js')
script
  window.onload = function() {
    var socket = io.connect('/test');
    socket.on('connect', function() {
      console.log('connected'); 
      socket.send('test message');
    });

    socket.on('message', function(msg) {