All source code snippets used in my blog

coffee-script-jquery-document-ready

jQuery ->
  alert "hello"

$ ->
  alert "hello"

get_facebook_like_counts_of_multiple_urls.php

<?php
// see fql docs:
// http://developers.facebook.com/docs/reference/fql/link_stat/

$url_list = array(
	'http://example.com/url1.html',
	'http://example.com/url2.html',
);

$url_string = '("'. implode('","', $url_list). '")';

// just like sql syntax
$fql = "select url, like_count from link_stat where url in".$url_string;
// remember to encode it
$url = "https://api.facebook.com/method/fql.query?format=json&query=".urlencode($fql);

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = curl_exec($ch);
curl_close($ch);

$json = json_decode($data, true);
$ret = array();
print_r($json);

// result example
/*
Array
(
    [0] => Array
        (
            [url] => http://example.com/url1.html
            [like_count] => 10
        )

    [1] => Array
        (
            [url] => http://example.com/url2.html
            [like_count] => 20
        )

)
*/

linux_create_user_modify_group.sh

# HOW TO CREATE USER AND GROUP, GRANT ROOT PRIVILEGE

## PART1 CREATE USER
# assume user1,user2,user3 is already created
# and they are in wheel group, which can execute as root
# and here we're creating a new user named:new_user

# create new user
useradd new_user
# set password for it, in the prompt
passwd new_user


# you can now login as new_user
# but when you run sudo you may get this error
new_user is not in the sudoers file.  This incident will be reported.
# so you need to set the privilege to new_user

## PART2 GRANT SUDO PRIVILEGE
## 1. BY CHANGE USER GROUP
$ visudo
############ in visudo ############
## Allows people in group wheel to run all commands
# %wheel        ALL=(ALL)       ALL
## Same thing without a password
%wheel  ALL=(ALL)       NOPASSWD: ALL
############ in visudo ############
# It means people in wheel group can run all commands, without password
# Below we're adding the new user called new_user to the wheel group.

# list users and user id, group id, home directory, login shell, etc.
$ cat /etc/passwd
...
wheel:x:10:root,user1,user2,user3
...

$ id -a [user name]
uid=503(user3) gid=503(init_group) 所属グループ=503(init_group),10(wheel)
$ usermod -g init_group -G init_group,wheel new_user
$ id -a new_user
uid=506(new_user) gid=503(init_group) 所属グループ=503(init_group),10(wheel)

## 2. BY ADD USER TO sudoers FILE.
$ visudo
############ in visudo ############
new_user          ALL=(ALL) NOPASSWD: ALL
############ in visudo ############

## some handy commands
# show user list
$ cut -d: -f1 /etc/passwd
root
bin
daemon
adm
...

# TODO
# what is the difference between -g(initial_group) and -G(group)

# Reference
# (ENG) http://superuser.com/questions/120340/user-not-in-the-sudoers-file-this-incident-will-be-reported
# (JPN) http://kazmax.zpp.jp/linux_beginner/usermod.html

multi-process-exec.php

<?php
/**
* 指定したプロセス数で並列処理を実行する
*
* @param array $url_list URLの配列
* @param boolean $url_as_key 結果配列を返すときに、urlをキーにする
* @param int $timeout タイムアウト秒数 0だと無制限
* @return array 結果配列
*/
function execute($url_list, $url_as_key = false, $timeout=0) {
    // set your process number
    $process = 5;

    $is_over_process = false;
    if ($process < count($url_list)) {
        // chunk url list / process number*
        $url_chunk = array_chunk($url_list, $process);
        $is_over_process = true;
    }

    $ret = array(); 
        
    if ($is_over_process && !empty($url_chunk)) {

        foreach ($url_chunk as $key => $url_list) {
            echo "chunk start:{$key}\n";
            
            $res = fetch_multi_url($url_list, $url_as_key, $timeout);
            if (!empty($res)) {
                $ret = array_merge($ret, $res);
            } else {
                continue;
            }

        }
    } else if (!$is_over_process && !empty($url_list)){
        $ret = fetch_multi_url($url_list, $url_as_key, $timeout);
    } else {
        echo "url invalid::";
    }
    
    return $ret;
    
}

/**
 * curl_multi_execの並列処理
 * ほぼboilerplate
 *
* @param array $url_list URLの配列
* @param boolean $url_as_key 結果配列を返すときに、urlをキーにする
* @param int $timeout タイムアウト秒数 0だと無制限
* @return array 結果配列
 */
function fetch_multi_url($url_list, $url_as_key, $timeout) {
    $mh = curl_multi_init();
    foreach ($url_list as $i => $url) {
        $ch[$i] = curl_init($url);
        curl_setopt($ch[$i],CURLOPT_RETURNTRANSFER,1);

        //タイムアウト
        if ($timeout){
            curl_setopt($ch[$i],CURLOPT_TIMEOUT,$timeout);
        }

        curl_multi_add_handle($mh,$ch[$i]);
    }

    //URLを取得
    //すべて取得するまでループ
    $active = null;
    do {
        $mrc = curl_multi_exec($mh,$active);
    } while ($mrc == CURLM_CALL_MULTI_PERFORM);

    while ($active and $mrc == CURLM_OK) {
        if (curl_multi_select($mh) != -1) {
            do {
                $mrc = curl_multi_exec($mh,$active);
            } while ($mrc == CURLM_CALL_MULTI_PERFORM);
        }
    }

    if ($mrc != CURLM_OK) {
        echo '読み込みエラーが発生しました:'.$mrc;
    }

    //ソースコードを取得
    $res = array();
    foreach ($url_list as $i => $url) {
        if (($err = curl_error($ch[$i])) == '') {
            // url_as_keyがtrueの場合、urlをキーとして格納
            if ($url_as_key) {
                $res[$url] = curl_multi_getcontent($ch[$i]);
            // そうでない場合は、ただ配列に入れる
            } else {
                $res[$i] = curl_multi_getcontent($ch[$i]);
            }
        } else {
            echo '取得に失敗しました:'.$url_list[$i].'<br />';
        }
        curl_multi_remove_handle($mh,$ch[$i]);
        curl_close($ch[$i]);
    }
    curl_multi_close($mh);

    return $res;
}


// 並列実行したいurl list
$url_list = array(
    "http://www.kinopyo.com/blog/ipad-2-not-charging-when-connected-to-pc-usb",
    "http://www.kinopyo.com/blog/the-first-app-i-installed-to-ipad2",
    "http://www.kinopyo.com/blog/chrome-warn-before-quitting-with-command-q-in-mac",
    "http://www.kinopyo.com/blog/reply-to-all-always-in-gmail",
    "http://www.kinopyo.com/blog/lion-fullscreen-shortcut-key-conflict-with-evernote-client",
    "http://www.kinopyo.com/blog/how-to-set-gesture-for-chrome-to-swipe-back-and-forth-in-lion",
    "http://www.kinopyo.com/blog/3-free-ebooks-for-study-coffeescript"
);

// start time
$start_time = microtime(true);

// execute
$res = execute($url_list, true);

// execute time
$time = microtime(true) - $start_time;

// play with the result
// here I just get the page title
$titles = array();
foreach ($res as $url => $html) {
    preg_match('{<title>(.*)</title>}',$html, $match_title);
    $titles[$url] = $match_title[1];
}

echo "Result:\n";
echo "time:{$time} sec\n";
print_r($titles);

set_server_time_with_ntpd.sh

# stop it first if it's running, 
# or you will get a warning like: 
# the NTP socket is in use, exiting
$ /etc/init.d/ntpd stop

# ntp.nict.jp: 日本標準時プロジェクト 公開NTP
$ ntpdate ntp.nict.jp
19 Aug 15:30:18 ntpdate[27156]: step time server 133.243.238.243 offset -856.532277 sec

# start ntp again
$ /etc/init.d/ntpd start

# confirm
$ date
2011年  8月 19日 金曜日 15:32:15 JST

update_rvm_and_ruby-1.9.2-p290.sh

# update rvm  
$ rvm get head  
# or older versions such as 1.0.0  
$ rvm update --head  
# you need to run reload to reflect the update  
$ rvm reload         
$ rvm -v
  rvm 1.7.2 by Wayne E. Seguin (wayneeseguin@gmail.com) [https://rvm.beginrescueend.com/]

# install ruby 1.9.2.p290  
$ rvm install 1.9.2-p290
  ...  
$ rvm list
  ruby-1.9.2-p0
  ruby-1.9.2-p180  
# you need to replace the p0 based on your environment  
$ rvm upgrade ruby-1.9.2-p0 ruby-1.9.2-p290
yes  
yes  
yes  ...  
Upgrade complete!  
$ rvm list
  ruby-1.9.2-p290 [ x86_64 ]  
$ rvm --default use 1.9.2
$ ruby -v
  ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin10.8.0]