tAp's blog

[PostgreSQL][Mac] Modify root password (Forgot password)

2011-12-24T15:46:00.001+07:00

sudo su postgres
supply your Mac password
modify /Library/PostgreSQL/9.x/data/pg_hba.conf

from local all all md5
to local all all trust

execute /Library/PostgreSQL/9.x/bin/pg_ctl restart -D /Library/PostgreSQL/9.x/data/
run psql
change postgres password

ALTER USER postgres WITH ENCRYPTED PASSWORD 'password';

modify pg_hba.conf back
restart again

Tested with PostgreSQL version 9.1 OSX Lion

Learn some Ruby syntaxes from company source code

2011-12-04T10:58:00.001+07:00

I think the fastest way to catch up Ruby and Rails idiomatic of my new company is to learn from it directly instead of learning from other available tutorials or books. Below is my note on this learning.

Rake

Exec shell command

use back-quote such as `ls`
return string from stdout
access Process object with $? such as $?.success
(not related to Ruby) `command 2>/dev/null` get rid of stderr

- string.chomp to remove new line in end of string

RSpec a lot of things on https://www.relishapp.com/rspec

[MacOSX] How to modify enviroment.plist without any additional tools

2011-12-01T21:43:00.001+07:00

Convert enviroment.plist to XML format with plutil -convert xml1 environment.plist
Edit it.
Convert it back to binary format with plutil -convert binary1 environment.plist

[RubyMine] invalid byte sequence in US-ASCII

2011-12-01T21:38:00.001+07:00

I had this problem when I tried to bundle install. This causes from System Environment Variables which RubyMine is using is different from you shell and LANG is default to US-ASCII.

You can fix this (For 10.6+) by add LANG=en_US.UTF-8 to ~/.MacOSX/enviroment.plist

Please checkout How to modify enviroment.plist without any additional tools

[VIM] Make newly created file(s) available for search with FuzzyFinder

2011-11-06T20:54:00.003+07:00

Once your FuzzyFinder has loaded current files, if you create a new file, you have to tell it to reload it by execute:-

:FufRenewCache

Source: FuzzyFinder : buffer/file/command/tag/etc explorer with fuzzy matching
Thanks: @virasak

How to add helper method to Cucumber's World

2011-11-06T20:42:00.001+07:00

Add this line to any files under features/supports/ directory

World({any_module_names})

Module's name here can be a predefined Rails's helper or your application helper or a new helper which is just created here.

Then you can access method inside the module in all of your Cucumber's step definitions.

Credit: #51 Integration Tests With Cucumber

Upgrade Ruby version which is installed with RVM

2011-10-30T22:52:00.000+07:00

Get latest Ruby version for RVM

rvm get latest

Find out current Ruby version

rvm current (the string between first '-' and '@')

Find out new Ruby version

rvm list known

Upgrade

rvm upgrade [current version] [new version]

[Rails] Redirect to previous page

2011-10-29T10:33:00.001+07:00

In controller, you can specify redirection to go back to previous page that call to this controller by using code below:

redirecto_to :back

Note: Rails 3.1

[Rails] Route alias

2011-10-29T10:24:00.000+07:00

You can execute "rake routes" to view display routes in your app.

The first column of output are route aliases which you can refer to in your app or test by append "_path" to that alias.

If you use resource in routes.rb, it will automatically generate CRUD routes and their alias for you.

But if you want to alias your other routes, you can do by append below after your routes

, :as => :{alias you want}

Note: Rails 3.1

[Heroku] Access Rails's model in migration, heroku rake db:migrate, uninitialized constant

2011-10-28T15:14:00.001+07:00

I wanted to use Rails's migration to add new column to a table and fill this column with default value.

add_column :students, :student_id, :integer

Student.all.each { |s| s.update_attributes!(:student_id => s.id+10000) }

I run this locally.

rake db:migrate

It worked without any problem.

Then I deployed to Heroku and run;

heroku rake db:migrate

I found this error.

uninitialized constant AddStudentIdToStudents::Student

After googling for a while, I found this blog post Heroku Migration Fails to Update Attributes: reset_column_information

The way to solve this issue(don't know why) is to open up the class inside migration file like this;

class AddStudentIdToStudents < ActiveRecord::Migration
class Student < ActiveRecord::Base; end
def change
add_column :students, :student_id, :integer
Student.all.each { |s| s.update_attributes!(:student_id => s.id+10000) }
end
end

This works for me.

Note: Rails 3.1.0

Update Rails 3.x

2011-10-21T13:42:00.003+07:00

Update gems

bundle update

Update Rails

rake rails:update

Credit: How to update a Rails 3 project to latest gems?

My Note from "The Intro to Rails Screencast I Wish I Had"

2011-10-16T12:15:00.000+07:00

I found that The Intro to Rails Screencast I Wish I Had is very good in demostrating some tricks that make Rails different to other web development frameworks.

Below are notes from my 2nd time watching this screencast. What I note are things that I've never known before or I can't really remember the way to use it.

Add -T in rails new to prevent rails from generating Test::Unit
Gems

turn (Pretty printing for test results)
guard-rspec (Autotest)
growl_notify
rb-fsevent
launchy

save_and_open_page (use along with Capybara statements)

Guard

guard init rspec
guard (start guard)

RSpec integration test

rails g integration_test {name}

Routes

rake routes
resources (auto routes)

Capybara (route_name comes from first column of rake route)

visit {route_name}_path
page.should have_content {string}
fill_in {id/name/label}, :with => {string}
click_button {id/name/label}
current_path.should == {route_name}_path
find_field('').value

ActiveModel

{Model}.create {value}
{model_instance}.update_attributes {fields hash}

form_for {object} do | f |
f.label :{name}
f.text_field :{name}
f.submit
render '{partial view(No _)}' <- partial view file name must prefix with _
flash.each do | name, message | (come from params passed with redirect_to)

Controller

render :text => params.inspect
redirect_to :back (previous page)
(redirect_to) {:notice | :alert} => {string} (will be available in flash)

Make Rails accept Non-English Characters

2011-10-08T15:16:00.001+07:00

Put following line to the first line of the page that contain Non-English characters

# encoding: utf-8

[VIM, Mac OSX] How to enable build-in Mac OSX matchit plugin

2011-09-17T23:44:00.002+07:00

Put these 2 lines to your .vimrc file

filetype plugin on

runtime macros/matchit.vim

Clean up CodeIgniter's database (ActiveRecord) memory usage

2011-09-12T21:39:00.000+07:00

As what I have found when I was researching there are 2 ways:

Prevent ActiveRecord from saving query

$this->db->save_queries = false;

credit: how can I free the memory used by $this->db->insert()

Free result memory - CodeIgniter will only reclaim memory when http query processing was returned. If you request is long, you have to free by yourself

$query = $this->db->query('SELECT title FROM my_table');
$query->free_result();

credit: last section of Generating Query Results

Useful VIM command that I still can't remember

2011-09-09T08:57:00.001+07:00

“0p - pastes the last explicitly copied text
:reg - Show a list of registers
J - Merge current line With Next Line
=, == - Fix indention
u,U(in visual mode) - lower, uppercase

Git - Global gitignore

2011-08-18T09:46:00.003+07:00

Some types of temporary files are spanding across project, such as .swp (VIM temporary file type).

To put *.swp to every project's repositories makes duplicate job.

One way to solve this issue is to put it to Global gitignore.

From this blog Git global ignores, i will copy to here, also.

- Create .gitignore file at somewhere, mostly at ~/

git config --global core.excludesfile ~/.gitignore

- An pattern of file, you want to do global ignore in to that file.

That's it.

[VIM] Mostly use FuzzyFinder and NERDTree shortkeys

2011-08-16T14:36:00.005+07:00

Basic VIM
- Open new horizontal split :sp file
- Open new vertical split :vs file
- Switch between split pane: Ctrl-w + { h|j|k|l }
- Rotate pane down/right: Ctrl-w + r
- For more, see Vim documentation: windows

FuzzyFinder
- Open in vertical split: Ctrl-k
- Open in horizontal split: Ctrl-j

NERDTree
- Open in vertical split: s

[Solved] autoscan: not found

2011-08-12T15:18:00.002+07:00

If you are in process of compiling something on Ubuntu and you get error similar to these

./bootstrap.sh: 24: autoscan: not found

You have to install autoscan program but you can not find autoscan with

sudo aptitude search autoscan

The package name you have to install is autoconf. I don't know why because I'm not an expert on C/Linux but after below command, the compilation works.

sudo apt-get install autoconf

Create simple Ubuntu(Debian?) start up script

2011-08-01T09:03:00.006+07:00

- Create a file at /etc/init.d/<filename>

#!/bin/bash

case "${1:-''}" in
'start')
# put the command to start
;;
'stop')
# stop command here
;;
'restart')
# restart command here
;;
*)
echo "Usage: $SELF start|stop|restart"
exit 1
;;
esac

sudo update-rc.d <filename> defaults

sudo /etc/init.d/<filename> <start|stop|restart>

- To remove

sudo rm /etc/rc*/*<filename>

Credit: Ivan in How do I make sphinx restart when I reboot my Ubuntu server?

Enable remote access to MySQL

2011-07-28T10:46:00.003+07:00

In MySQL config file, such as my.cnf
- comment out skip-networking
- add bind-address = YOUR_HOST_IP
- restart mysqld
- log in to mysql from server machine
- do GRANT ALL ON DATABASE.TABLE TO USERNAME@'HOST_IP/NAME' IDENTIFIED BY 'PASSWORD'; (Quote is required.)
- on client machine log in with > mysql -u USERNAME -r PASSWORD -h YOUR_HOST_IP

P.S. If there is no config file you can copy/rename from my-*.cnf in mysql directory

Credit: How Do I Enable Remote Access To MySQL Database Server?

More advance commands for moving cursor and screen in VI

2011-07-25T11:29:00.004+07:00

These are VI commands I have just learned today

F = reverse of f
t = f and step back 1 char
T = reverse of t
; = repeat f, F, t and T

H = Move cursor to first line of the screen
M = Move cursor to middle of the screen
B = Move cursor to last line of the screen

z. = Move screen to make cursor to middle of the screen
zt = Move screen to make cursor to top of the screen
zb = Move screen to make cursor to bottom of the screen

Ctrl+f = Scroll down 1 screen (Ctrl+d only half screen)
Ctrl+b = reverse of Ctrl+f

Ctrl+e = Move screen down 1 line with the cursor try to stay at the sameline
Ctrl+y = reverse of Ctrl+y

How to install PHPUnit to Mac OSX

2011-07-14T11:22:00.003+07:00

- Install PEAR

curl -O http://pear.php.net/go-pear.phar
php -d detect_unicode=0 go-pear.phar

- Install PHPUnit

sudo pear channel-discover pear.phpunit.de
sudo pear channel-discover pear.symfony-project.com
sudo pear channel-discover components.ez.no
sudo pear install --force --alldeps phpunit/PHPUnit

- Set phpunit bin path to System Environment Variables

Credit
Getting and installing the PEAR package manager
PHPUnit Installed on Mac OSX

[Solved] Ubuntu can not use webcam for video call, while Cheese is working properly

2011-07-11T21:03:00.004+07:00

This post is not for people who is facing Linux webcam driver issue, it is for people who can get webcam working (with some application, such as Cheese) but webcam is not working for video calling like Skype or Google video call.

I also don't know the cause but for solution is to set this to environment variable before running video call application

LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so

For convenient, you can rename the original application bin file to other name and making below script naming as bin file.

For example, I did rename my /usr/bin/google-chrome to /usr/bin/google-chrome.real and create a script at /usr/bin/google-chrome with below content

#!/bin/sh
LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so /usr/bin/google-chrome.real

Now Gmail video call on my Google Chrome should work. (Skype also can do the same way)

Tested with Ubuntu 10.04 on 32-bits machine.
Credited to some forums in internet. Sorry for forgotten.

[VIM] config per file type

2011-06-21T14:56:00.002+07:00

add to your .vimrc

autocmd FileType [type] setlocal [configs...]

[Git] Rebase

2011-02-24T12:23:00.003+07:00

So far I have used git rebase for 3 scenarios.

Want to add more change in the commit that is not the last commit of any branch. Use git rebase -i

Want to move whole different branch to base on another branch.

      A---B---C topic
     /
D---E---F---G master

              A'--B'--C' topic
             /
D---E---F---G master

git checkout <branch-to-move>
git rebase <base-branch>

Want to move part of different branch to base on another branch.

    o---o---o---o---o  master
        \
         o---o---o---o---o  next
                          \
                           o---o---o  topic

o---o---o---o---o  master
    |            \
    |             o'--o'--o'  topic
    \
     o---o---o---o---o  next

git rebase --onto <new-base-branch> <old-base-branch> <move-branch>

[Git] delete/remove remote tag

2011-02-23T12:04:00.003+07:00

To delete/remove remote branch in Git, you use

git push <remote*> :<branch-to-remove>

Also to delete/remove tag in remote server, you can use

git push <remote> :refs/tags/<tag-to-remote>

These commands might seem weird and hard to remember. To be able to remember them easier, I suggest you to see this full git push command

git push <remote> <local-branch-name>:<remote-branch-name>

Then to delete is to push empty branch to expected branch on remote. That's all why.

*remote is an alias of other repository see git remote
Credit: How to: Delete a remote Git tag

[Git] Ignore change of a file that is in an index

2011-02-16T12:57:00.002+07:00

There is a command git update-index --assume-unchanged <file> for ignore.
And there is a command git update-index --no-assume-unchanged <file> for unignore.

For listing assume-unchanged files use git ls-files -v and see lower h in front of file name.
You can combine this with grep "h ". And you can also use git ls-files -v if you are interesting only a file.

[Git] partially add some changes in a file to index

2011-02-16T12:45:00.006+07:00

- Use git add -i (<filename>)
- Select 5 (or p) then enter to see changes for selection.
- Choose files by type number in front of each file name and enter.
- Enter again to start.
- Type y or n to choose or not choose changes.
Type s to divide changes to smaller sectioin.
Type e to manually choose change.
- After back to main prompt choose 7 (or q) and enter to leave.

Ant OS specific value

2011-02-08T11:36:00.004+07:00

<condition property="os.dep.value" value="value for MacOSX">
  <os family="mac" />
</condition>

<condition property="os.dep.value" value="value for Windows">
  <os family="windows" />
</condition>

<condition property="os.dep.value" value="value for Unix" >
  <os family="unix" />
</condition>

Use as "${os.dep.value}"

Creadit: Can I make the Ant copy task OS-specific? - Stack Overflow, How to make a conditional decision in an Ant build script based on operating system | java ant | devdaily.com

Generate current Git version in Ant for Hudson

2011-02-02T10:42:00.003+07:00

At the time I wrote this blog there is no Git Ant task. Workaround for getting current commit version is to use exec directly invoke git describe as below.

<exec executable="git" outputproperty="build.commit">
    <arg value="describe"/>
    <arg value="--tags"/>
    <arg value="--abbrev=20"/>
</exec>

Now you can get result value of git describe from ${build.commit}.
Credit: How to lookup the latest git commit hash from an ant build script - Stack Overflow

But there is also some problems with Hudson's git plug-in which it always tags build revision that causes our git describe return the wrong result. There was someone send patch to fix this but this is not build to the plug-in yet. Currently workaround is provided in that patch page, add paramter to git describe, "--match=[^(hudson)]*", to ignore tag from Hudson. So we have to add more arg line to Ant's exec task:

<arg value="--match=[^(hudson)]*">

That's all.

Disable SSH host key checking

2011-02-02T10:07:00.003+07:00

I summarized this from Linux Commando: How to disable SSH host key checking

He suggested 3 approaches

$ sed -i 3d ~/.ssh/known_hosts
Use parameters
* StrictHostKeyCheckin
* UserKnownHostsFile
ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no username@hostname
Config file ~/.ssh/config (or /etc/ssh/ssh_config for global) & restart ssh
Host 192.168.0.*
StrictHostKeyChecking no
UserKnownHostsFile=/dev/null

[Java] What will be printed to a console?

2010-11-22T15:01:00.004+07:00

ArrayList<Integer> list = new ArrayList<Integer>();
list.add(1);
list.add(2);
list.add(3);
list.remove(1);
System.out.println(list);

Note for starting new Eclipse workspace

2010-11-18T10:49:00.002+07:00

Import Formatter.
Customize Save Actions.
Set text editor "spaces for tabs" and "displayed tab width".
For MacOSX, change "Content Assist" short-key.
Set content assist to help import favorite static members.

[Java] Jars inside Jar

2010-11-01T11:23:00.002+07:00

Jar that contains multiple jars inside is not support directly by Java. There are some workarounds on this.

Put jars in to jar as ordinary files then load them with your own customized classloader. There is a tool such as One-JAR™ but some people told that it causes performance problem (I have not try this).
Extract jars to .class and pack them together to a single jar. You can archive this easily with Ant's Zip Task

For me, I choose the second approach. There are more workarounds in reference links below.

Java: Easiest way to merge a release into one jar-file
Is it possible to package all the jar dependencies in one big jar ?

Ubuntu RAR package file name character encoding problem

2010-10-31T10:01:00.003+07:00

In my Ubuntu (currently version 10.10), package named "rar" has encoding problem with file that has file name in Thai. But for package named "unrar" there is no problem.

Graceful OSX Shutdown from command line

2010-09-18T09:51:00.002+07:00

If you use shutdown -h now running GUI programs will be forced to close. To tell them to close use

osascript -e 'tell application "System Events"' -e 'shut down' -e 'end tell'

Credit :

Hg - How to combine many dirty commits to one

2010-06-17T22:00:00.002+07:00

You can also make dirty research branch and remove it when done in Hg. Credit to Concatenating multiple changesets into one

The concepts are

Jump to a changeset that is your last stable(good) changeset with command 'update'.
Use command 'revert' to the last changeset of dirty branch*.
Commit reverting, this will produce new head.
Remove old head with command 'strip'** or pull from other repository the new head with command 'pull -r' and delete this repository.

* The Branch in this context means any branches in Hg graph does not mean to only Hg named branch.
** Strip is an Hg extension.

VIM - How to format and syntax highlight JSON file

2010-05-10T11:52:00.005+07:00

Formatting

Run this command in shell sudo cpan JSON::XS

Put this line to ~/.vimrc map <leader>jt  <Esc>:%!json_xs -f json -t json-pretty<CR>

When want to format JSON file press
\jt
credit : “tidify” a json in vim

Syntax highlighting

Download json.vim form http://www.vim.org/scripts/script.php?script_id=1945 to ~/.vim/syntax/
Put this line to ~/.vimrc
au BufRead,BufNewFile *.json set filetype=json
credit : Add JSON syntax highlighting in Vim on OS X

VIM - How to format Html source code

2010-04-23T16:14:00.003+07:00

:filetype indent on
:set filetype=html
:set shiftwidth=n (n = indent size)
:set smartindent
gg=G (gg = top of file, = is a shortcut of re-tindent, G = botton of file)

For 1,3,4 , you can predefine at .vimrc. While editing Html file, just do 2 and 5

VIM - How to format JavaScript source code

2010-04-23T15:48:00.006+07:00

Download this plugin jsbeautify
Copy it to $HOME/.vim/plugin/
In Vim, while you want to format JavaScript code, press \ff*

* From jsbeautify's document tells to press <leader>ff which in Vim <leader> by default is set to "\"

Singleton vs Class method

2010-03-25T15:29:00.002+07:00

I want to tell you before go on through the detail that following article is based on Java. Different implemented language might not have the similar behavior.

Singleton or Class method ?

This topic might too old for some of you but I always was reminded to this issue when I was going to write some method just do some algorithms - take inputs, processing, return output.

We will find many discussions on this issue if we do googling. Below this are what I conclude those discussions for myself.

Singleton provides typing. You can subclassing or passing it around whatever you can do to an object-oriented instance you can do to Singleton object.
Singleton provides state which a lot of you may think it is disgusting.
Singleton provides lazy-initialization. You have not to have it on your memory until you are really want it.
You can have many instances of Singleton-type. Also can limit number of them. While you can not do this with Class method.

I'm going to update this if I find more distinction points

Shutdown Mac OS X with command line

2010-01-11T11:53:00.003+07:00

I have founded that ordinary

$shutdown -p now

command line not enough to close Mac box. It doesn't turn the machine off.

After some googlings, I founded this The Command Line Junkie's Guide To Mac OS X,

which tell me that I can shut it down with command :

osascript -e 'tell application "Finder" to shut down'

Java thread stack size

2010-01-07T14:14:00.003+07:00

Today, I have just known that there's an another interesting parameter to set to JVM. It is java thread stack size.

With too high thread stack size, it will effect to low number of thread JVM can create - see this experiment. Not enough memory for java thread (cause from too big stack size) will produce "java.lang.OutOfMemoryError: unable to create new native thread"

You can set java stack thread size by adding -XssnK to JVM argument where n stands for a wanted size.

Now, I am not sure what is the default java thread stack size. Someone tells it is 512Kb. Another one tells it is up to the platform. One thing is that it's vary between each java versions. However, there is a way to get it from your running JVM. I got this trick from Get thread stack size at runtime thanks to claudio. Note that this trick may work only with *nix family.

First, you have to know your target JVM's pid (process id). If your system has only one JVM running, it is easy to use 'ps' or top to find it. But if it has many, my often used approach is to use

jps -lv

and justify it from the informations provided. If the informations are equally the same, help yourself :P.

Now you have target JVM's pid.

Then run following command

jinfo -flag ThreadStackSize {PID}

The jvm's set thread stack size will show to you in Kb.

How to connect VPN via PPTP with Ubuntu

2009-11-28T15:57:00.004+07:00

I had tried to connect to my office local network with my Karmic machine via PPTP protocol. I saw a VPN stuff when clicked 'Edit Connections' of NetworkManager Applet (normally on top left of you screen) but couldn't do anything to it. So I started googling and found below.

First, I had to install PPTP for NetworkManager

sudo apt-get install network-manager-pptp

Now, we can do setting PPTP VPN.

Just enter gateway, username and password your PPTP VPN will be now ready to work.

But for me, I want to go out to normal internet with my internet router not to go through my office network. I have to do something a bit.

In editing vpn, click on tab IPv4 setting -> Routes.

Enter ip(s) that want to use vpn and netmark.

You can leave another 2 columns, gateway and metric blank.

Thick in box "Use this connection only for resources on its network"

done.

Credit : VPN - Ubuntu Wiki, Howto configure PPTP VPN in Ubuntu Intrepid and Jaunty
Testing OS : Ubuntu 9.10 (Karmic Koala)

[FIXED] This project needs to migrate WTP metadata

2009-06-05T13:38:00.003+07:00

After I checkout code from SVN repository, some of my Eclipse's projects alert this error

"This project needs to migrate WTP metadata"

and it's no provide clue for solve them.

I found this thread Eclipse error: This project needs to migrate WTP metadata

There's a way to solve this error almost bottom of the page.

Just right-click at alerting project and click "Validate"

Then the problem must be solved

Advance Ubuntu keybindings setting

2009-05-31T11:51:00.005+07:00

You can go to System -> Preferences -> Keyboard Shortcuts for normal shortkey setting but it isn't enough for me because it isn't work with "Windows" key.

I want Windows+d to bind to "show desktop" as used in Windows but Keyboard Shortcuts doesn't work in this case.

And I found from here How come pressing Super+D doesn't show my desktop?

There's deeper setting.

Run gconf-editor (at command line)

and went to apps -> metacity -> global_keybindings and change "show_desktop" from "d" to "d" (Mod4 is represent Windows key)

And I have also binded "run_command_terminal" to "t"

Configurations after installation my Jaunty Jackalope

2009-05-31T11:18:00.007+07:00

After clean installation new Ubuntu - Ubuntu 9.04 or Jaunty Jackalope, I have made many configurations and installing softwares.

For softwares installations, I chose from Add/Remove so nothing to remember just tick and click but I might forget what and how to make some configurations next installtion time so below is my jot down about these.

Enable gsynaptics by Enabling SHMConfig and Disabling the Touchpad Temporarily While Typing. Adding disabling to Application Startup with 0.3s disable
VIM - tab size & tab to space setting with 2 space tab size
Ubuntu : Automount NTFS Drive
Advance Ubuntu keybindings setting
Firefox : add-ons - Delicious, NoScript, Google Reader Watcher, Gmail Notifier, DownThemAll : Adobe Flash player plug-in : config every font types from default and Serif to San serif and don't allow web to choose

That's all for now. I will add it if more configurations are added

Ubuntu : Automount NTFS Drive

2009-05-31T10:24:00.002+07:00

For my Ubuntu (9.04), automount ntfs drive don't come out-of-box. It might have been happening for many versions but I didn't notice.

This automount have made some problem to me. For instance, my Rhythmbox Library. Because my musics file was keeping in ntfs drive, so everytime the system was boot the library was error because the drive hadn't mounted. So I want automount very much.

I think I might have fixed it for my 8.04. For 8.10, I used synaptic upgrade from 8.04 so it might still have the configuration from 8.04.

The issue was happended again when I have a clean installation with Jaunty Jackalope.

After some googling, there are many ways to fix this issue but it's too many things to do than I think it should be. Such as fix fstab blah blah. With a great community, there must be easy way to do this.

And now I have found it. Easy one

credit from Joeb454 : HowTo: Automount NTFS Drives

You can follow this link to tg/showthread.php?t=785263he solution or see the summarization for myself below.

Install ntfs-config (via apt-get)
Unmount wanted drive (if it had mounted)
Open it (somewhere in menus or run with command line)
Choose drive(s)
Enable Write Support for Internal Drives

That's all! After you boot up your system again, you drive will be automounted.

How to show hidden and protected files in OS X Finder

2009-04-07T15:32:00.003+07:00

I have followed the method from the following blog How To Show Hidden and Protected Files in OS X Finder

but for my convenient I will make a summarize here.

There is just only 2 steps

defaults write com.apple.finder AppleShowAllFiles TRUE
killall Finder

boom!!! Your hidden files is shown.

Add more Listenning port to Apache Http Server for Ubuntu

2009-03-19T13:30:00.004+07:00

I have to tell you that this is my method. I'm not sure is there any better workaround to handle this. I'm on Ubuntu Intrepid Ibex.

First, I add this 2 lines to /etc/apache2/ports.conf (I'm gonna add listenning port at port 8000)

NameVirtualHost *:8000
Listen 8000

Second, Edit file named /etc/apache2/site-enabled/000-default by following step

copy content of all in and paste text next to the old one and change *:80 of the new one to *:8000

So you have something similar to this ......

Last, restart your apache with this command "/etc/init.d/apache2 restart"

Booom! Your Apache Http Server will now can listen to 8000 port.

Failed memo :
1. can't restart apache with this command apache2 -k restart
2. If adding just Listen 8000 in /etc/apache2/ports.conf, the 8000 port query is listenned but no thing is displayed.

Shared folders for Windows XP guest on Virtualbox

2009-03-19T13:24:00.002+07:00

After set shared folders at Virtualbox, Windows XP finds that folder by itself.

It's at

My Network Places -> Entire Network -> VirtualBox Shared Folders

notice : one thing I'm not sure is that I have already install Virtualbox guest addtions before set this shared folders

Ubuntu video screen capture

2009-03-18T15:27:00.003+07:00

This blog is my memo.

I have use recordMyDesktop for do a video screen capture. Its functions is ok for me. I was install it via Synaptic Package Manager.

Shared folders for Windows 7 Beta guest in Virtualbox 2.1.4

2009-03-18T15:09:00.003+07:00

I found the trick here. I have tried it and it's work for me. My machine is Ubuntu Intrepid Ibex which running Virtualbox 2.1.4

- open Regedit (as administrator)
- navigate to this key and change the value to 0 (zero): HKLM\SYSTEM\CurrentControlSet001\Services\VBoxGuest\Start
- reboot the Windows 7 guest
- create a shared folder
- Navigate to (or map to a letter) \\vboxsvr\SHARENAME

[Solved] Can't connect with wired DHCP enabled ADSL router in Ubuntu Intrepid (8.10)

2009-03-16T16:08:00.007+07:00

I got a problem that my Intrepid can't connect with wired DHCP enabled ADSL router, which it works fine with other machines running Windows XP

After googling awhile, I found this thread Can't connect to internet via ADSL with 8.10. And my problem was solved with the method in it.

I will summarize it here once :

1. Remove the words "interface-mtu" out of /etc/dhcp3/dhclient.conf

2. Edit /etc/NetworkManager/nm-system-settings.conf and changed managed=false to managed=true.

3. Reboot

done.

hope it's also work with your machine.

OGV to AVI with mencoder

2009-02-14T16:19:00.003+07:00

I have a problem with importing video file that extension is ogv to Openoffice Impress so I decided to convert it to avi. After googling a while I got following commands (I just copy & paste it, will examine it later)

mencoder input.ogm -ovc xvid -oac mp3lame -xvidencopts pass=1 -o output.avi

and

mencoder -idx input.ogv -ovc lavc -oac mp3lame -o out.avi

How to save flash file (swf) using firefox

2009-02-08T01:23:00.003+07:00

call following command in address bar

about:cache?device=disk

ctrl-F to find swf you want by search the URL name of web page where wanted flash reside

then you can download as usual file

Testing platform : Ubuntu8.10 with Firefox 3.0.5

credit : Download & Save Flash Animation Files in Firefox or IE

How to convert unreadable mp3 tag in Ubuntu?

2009-01-23T20:55:00.007+07:00

In Asian language (for me, Thai) always suffer unreadable mp3 tag. Here is a workaround to solve it.

install python-mutagen with this command

sudo apt-get install python-mutagen

cd to directory that your files at

and use it with this command

find . -iname "*.mp3" -execdir mid3iconv -e [encode] {} \;

done.

you can choose encode that suit to your language here. For Thai user use ISO-8859-11

credit : ConvertingMP3Tags

Copy non-formatted(plain) text in Ubuntu

2009-01-19T01:33:00.003+07:00

Sometime, when we are browsing in the rich text place such as web page and we want to copy some text to our writing field (also rich text field too) without text format but normally it can not do.

In Ubuntu, there is a tool to help you called "Glipper"

you can install it with this command

sudo apt-get install glipper

and then you can add it to your panel. Its name is "Clipboard manager" in Add to Panel menu.

Ubuntu CPU temperature monitor

2009-01-19T01:27:00.003+07:00

To monitor temperature of CPU, I'm using panel's item called "Computer Temperature Monitor"

To get it use this command

sudo apt-get install computertemp

then you have to add it to you panel by right-click at a panel, select Add to Panel. Then search with word "temp". There, that's your item to add

My first shell script

2008-12-22T09:25:00.003+07:00

I'm the one of English Premiere league fans but my dorminitory doesn't provide TV channel for it. So I have to find out my own. Fortunately, there are several pirate channel available on the internet in the shape of p2p client. One of that is Sopcast

Sopcast provides very easy using application for Windows OS user but it's not me. For Linux user there are a program that can invoke by command line and you have to use your own media player to play it yourself (In fact, there are someone writing linux's front-end Sopcast but it's not work in the way I want)

My problem is that I can't remember the command to run it. Every weekend, I have to open README file of Sopcast for the program running instruction. So I decided to write a script to handle it automatically. And it's also my first shell script ever. Here it is.

#!/bin/sh

echo Start Sopcast at $1
/usr/local/bin/sp-sc $1 3908 8908 > /dev/null &
echo Waiting for Sopcast starting
sleep 10
vlc http://localhost:8908/tv.asf

From now on, any other weekend, no README file. This makes me love not-Windows OS more and more.

VIM - tab size & tab to space setting

2008-12-20T12:56:00.005+07:00

to change tab size use this command
:set ts=n
(n=expected size ,ts=tabstop)

to change tab to space use this command
:set et
(et = expandtab)

also invoke it together like this
:set ts=4 et

if you want permanent changing, add command above to file named .vimrc (normally is at your home folder)

FreeBSD Assignment#1 Answer

2008-12-15T00:04:00.003+07:00

หลังจากหมดเขตส่งแล้ว(00.00 12/15/2008) ก็เอางานมาโพสหน่อยละกัน อาจจะไม่มีประโยชน์สำหรับคนอื่นเท่าไหร่ แต่ก็เผื่อมาอ่านผ่านๆ ตา แล้วค่อยไปค้นเนื้อหาเต็มต่อละกัน

เป็นงานย่อความของลิงค์ต่อไปนี้
- http://www.freebsd.org/cgi/man.cgi?query=tuning
- http://www.freebsd.org/doc/en/books/handbook/configtuning-kernel-limits.html
- http://silverwraith.com/papers/freebsd-tuning.php
- http://www.freebsd.org/doc/en/books/handbook/configtuning-disk.html
- http://www.freebsdonline.com/content/view/521/515/

ให้ cover หัวข้อต่อไปนี้
- What is the target subsystem being tuned?
- Why tune the target subsystem?
- How? That is, briefly, what is the approach used to tune the subsystem?

เข้าไปดูได้เลยที่ link นี้ http://docs.google.com/Doc?id=dcmk32tk_17ggmd5xf4

How to make canon LBP2900 work on Ubuntu

2008-12-12T09:11:00.005+07:00

Follow some steps from this HardwareSupportComponentsPrinters CanonPrinters Canon_LBP_2900

I'm using Intrepid. It's work.

Fragment Size

2008-12-09T17:58:00.008+07:00

From my assignment of FreeBSD class, I wanna know the meaning of "fragment size". Because of there no an explanation in the first Google result page so I write this blog for you. ^^

Fragment size is a threshold whether this file will hold full block size allocation or not. If the allocating file size more than fragment size, it will get full block size. If not, it will store in the minimum necessary number of contiguous fragments.

credit : File-System Fragment Size

[TinyOS 1.x] Lesson4

2008-12-07T16:05:00.004+07:00

From "IntOutput = IntToRfmM;" The equal sign (=) means interface IntOutput provided by current file is equivalent to the implementation in IntToRfmM (mostly use in interface provided configuration file)
Can look how to send and receive via radio at IntToRfm and RfmToInt respectively. (Too much detail to make a summary. Just look at the code can get the idea)

This blog is summarized from Lesson 4: Component Composition and Radio Communication

[TinyOS 1.x] Lesson3

2008-12-07T13:53:00.007+07:00

Task declared syntax is

task void taskname(){}

Task dispatched syntax is

post taskname();

Task can post from command event or another task. It's better to use series of small tasks

This blog is summarized from Lesson 3: Introducing Tasks for Application Data Processing

[TinyOS 1.x] Lesson2

2008-12-02T19:18:00.008+07:00

In uses brackets can declare interface ?? as ???; to perform as another instance of an ?? interface.
ADC is also in tos/interfaces
Components declaration can also us as
"Ased interface" in module can wire in configuration.
parameterized interface is a multiple instance of an interface that parameterized at runtime. It can express like this. SenseM.Timer -> TimerC.Timer[unique("Timer")];
Because of this line "provides interface Timer[uint8_t id];" means Timer provide 256 different instances one for each uint8_t value
unique() function uses to generate unique 8-bit number. The group of unique can specify by use the same String as the parameter of the function

This blog is summarized from Lesson 2: Event-Driven Sensor Acquisition

[TinyOS 1.x] Lesson1

2008-12-01T18:33:00.007+07:00

This blog series "TinyOS 1.x" is for helping me to remember the knowledge that I have learned and forget it later since it's not an everyday used language (And also because I still didn't get all its concepts) You know today is the third time that I will start read its tutorial again. What I wanna tell you is that this blog series may be useless for you guy because it's just for my memo. Let's start then...

There is an interface. That the users must implement events and the provider must implement commands.
An application consists of components. Each component has configuration(wiring) and module(implementing)
There're 2 threads of execution - tasks(not preempt another), Hardware event handlers(preempt another) declared with async keyword.
In configuration file

configuration [name]{}
implementation {
[components declaration]
[wiring] Main.StdControl -> ??.StdControl; ..
}

Main.StdControl.init() is the first executing command of any application.
StdControl interface is at tos/interfaces/StdControl.nc
Timer is at tos/interfaces/Timer.nc
SingleTimer is at tos/lib/SingleTimer.nc
BlinkM.Leds -> LedsC is really shorthand for BlinkM.Leds -> LedsC.Leds
In module file

module [name]{
provides{[interface that is wired in configuration]}
uses{[interface that wire to in configuration]}
}
implementation{
command..
event..
..
}

Timer is an interface for fire event at interval time

this blog is summarized form TinyOS Tutorial Lesson 1: Getting Started with TinyOS and nesC

Share files between Linux host & Linux guest on Virtualbox

2008-11-11T09:48:00.003+07:00

Make Virtualbox know which folder you want to share
Devices -> Shared Folders -> Add New Shared Folder
Fill shared folder destination and its name for calling in the guest (Also tick read only or permanent as you wish)

In the guest's terminal
Create folder somewhere you want which the name as what you defined.
Use this command
sudo mount -t vboxsf [folder's name] [the path where the folder is at]

credit : Sharing Folders Between Host and Guest

How to get USB work in Intrepid

2008-11-09T12:44:00.001+07:00

The work around to enable USB in Intrepid is different from Hardy.

The way to do that is to add this below line in the bottom line of /ect/fstab file

#usbfs
none /proc/bus/usb usbfs devgid=46,devmode=664 0 0

that is it!

credit : Intrepid/Virtualbox/USB

Mount ISO image on Ubuntu

2008-10-30T12:42:00.001+07:00

Mount
sudo mount -o loop -t iso9660 [ISO image] [Mount point]

Unmount
sudo umount [Mount point]

Swappiness - รับค่าโอกาสในการไปใช้ swap แทน ram

2008-09-05T21:55:00.003+07:00

เนื่องจากผมรัน vmware player แล้วรู้สึกว่าช้ามากจึงไปเช็คที่ Gnome System Monitor ในตอนแรกมองข้ามไป ว่า vmware ไม่ได้กิน resource อะไรเลย แต่ก็งงว่า ที่ตัว process ของ vmware นั้นบอกว่าใช้ memory กว่า 400 MB แต่ทำไม ram ของเราถูกใช้ไปแค่ 400 MB เช่นกัน หงุดหงิด กับสปีดของ vmware อยู่นาน ก็เพิ่งจะได้สังเกตดว่า จริงๆ แล้ว ram ที่ตัว vmware เราใช้นั้นไปอยู่บน swap ซะหมดเลย (มิน่าหละ ทำไมทำอะไรแต่ละที Hard disk ทำงานหนักเหลือเกิน)

จึงทำการหาวิธีการจัดการกับ swap จนไปพบว่าเราสามารถปรับแต่โอกาสในที่จะให้เจ้า Ubuntu ของเราไปวาง memory ไว้บน swap ได้ ด้วยค่า swappiness นี่เอง ซึ่งปกติจะตั้งไว้ที่ 60 แต่จริงๆ เค้าแนะนำไว้ที่ 10 (ยกเว้น งาน server ที่เค้าบอกว่าน่าจะ 60) ตามนี้เลย

ถ้าต้องการตรวจสอบค่า swappiness
cat /proc/sys/vm/swappiness

ถ้าต้องการเปลี่ยนค่า swappiness ชั่วคราว
echo 10 > /proc/sys/vm/swappiness

ถ้าต้องการเปลี่ยนค่า swappiness ถาวรเปลี่ยนค่าที่ไฟล์นี้
gksudo gedit /etc/sysctl.conf
โดยเพิ่มบรรทัดนี้ เข้าไป
vm.swappiness=10
แล้วทำการ reboot

จาก Performance tuning with ''swappiness''

ปล. พบว่าถึงแม้ว่าจะตั้งค่าเป็น 0 ในบางโอกาส OS ก็ยังไปใช้ swap อยู่ดี

Google Keyword Suggestions

2008-08-29T11:10:00.000+07:00

ประโยชน์ มีดังนี้

เพิ่มเติมจากคำที่เราพิมพ์ผ่านมาให้เลือก (เพื่อความ specific ของคำค้นหา)
เดาการพิมพ์ผิด
ลดจำนวนครั้งการพิมพ์

จาก At a loss for words?

เทคโนโลยีเบื้องหลัง Google ranking

2008-07-24T16:28:00.000+07:00

หลักการของระบบ search ของ Google มีดังนี้

เข้าใจหน้าเว็บ ว่าเป็นนั้นคือเว็บอะไร อยู่ที่ไหน ฯลฯ
เข้าใจคำ search แก้คำสะกดผิด, แปลคำที่มีความหมายใกล้เคียงกัน, การขยายความกันและกันของคำ search
เข้าใจผู้ search ว่าอยู่ที่ใดบนโลก ต้องการผลแบบใด, ความสนใจ-ชอบ ส่วนบุคคล, แก้ความเข้าใจผิด, หาคำเดียวกันบนภาษาอื่น

จาก Technologies behind Google ranking

Fix no sound flash 9 in Firefox 3 Ubuntu 8.04

2008-06-05T07:45:00.005+07:00

Just this command

sudo apt-get install libflashsupport

done

credit : Michael Nagel from Ubuntu 8.04 - No Sound In Firefox Flash, Trying To Upgrade To Flash Player 10