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archivesSome useful commands in Linux administration when making a website.
This is a cheatsheet of useful commands in Linux administration when making a website in Rails. I am using these commands over and over again so I thought it might help someone.
Linux
—–
Detailed list of files
ls -l
List the running processes
ps -e
Create a directory
mkdir demo
Kill the use of a specific port (I use it when Aptana/RadRails crashes and do not close the port)
fuser -k 3005/tcp
Delete a directory and subdirectories, without confirmation, verbose mode. (BE CAUTIOUS !)
rm 20080120165422/ -r -f -v
Add a cron jon
crontab cron_job.txt
List cron jobs
crontab -l
Create cron job
crontab -e
Mount a local virtual directory for an actual remote directory
sshfs ‘-oworkaround-rename’ username@ssh.domain.com: /home/username/remote/
MySQL
—–
Connect to mysql local server:
mysql -u username -p
Connect to mysql remote server:
mysql -u username -h mysql.domain.com -p
Create databases (Rails style)
CREATE DATABASE demo_development;
CREATE DATABASE demo_test;
CREATE DATABASE demo_production;
Rails
—–
Create a rails app
rails demo
Install a plugin
script/plugin install git://github.com/pullmonkey/open_flash_chart.git
Install a plugin, force reinstall
script/plugin install git://github.com/pullmonkey/open_flash_chart.git –force
Launch server on a specified port
script/server -p 3005
Open a console where you can send ruby commands to your app (Extremely useful!) in dev mode
script/console development
Open a console where you can send ruby commands to your app (Extremely useful!) in prod mode (BE CAUTIOUS !)
script/console production
Migrate the database
rake db:migrate
Migrate the database to a given version
rake db:migrate VERSION-22
Migrate the production database
rake db:migrate RAILS_ENV-production
Install gem
gem install RedCloth
Install a given version of Rails
gem install -v-2.0.2 rails
Git
—
Checkout a repo
git clone git://github.com/pullmonkey/open_flash_chart.git
Get the differences
git diff
Fetch from and merge with another repository or a local branch
git pull
Checkout
git checkout
Configure the user settings
git config –global user.name "toto"
git config –global user.email "toto@example.com"
H
Posted in Linux | no comments |
A Rails/OFC/Ajax raw example
Here is a simple exercise to use Rails, OFC, OFC rails plugin and ajax together. The idea is just to follow the example given here in php. At first I did not manage to get this working. That is why I asked some help to Pullmonkey. He did a great job to make this working in this nice post . Moreover, he came up with nice improvements on OFC to render a chart using ajax and using Rails helper to keep a pretty code (you need to update OFC plugin to make his example work). However I want to show you here the translation in Rails of Teethgrinder’s tutorial with minimum code (no need to update OFC plugin).
Controller code (test_it_controller.rb), notice it has the original php code from teethgrinder in it.
class TestItController < ApplicationController
def tuto_5
title = Title.new("tuto_5")
#$title = new title( date("D M d Y") );
#$chart = new open_flash_chart();
@chart = OpenFlashChart.new
#$bar = new bar();
bar = BarGlass.new
#$bar->set_values( array(9,8,7,6,5,4,3,2,1) );
bar.set_values([1,2,3,4,5,6,7,8,9])
#$chart->set_title( $title );
@chart.set_title(title)
#$chart->add_element( $bar );
@chart.add_element(bar)
end
endThen I had directly coded the view code (tuto5.html.erb) without helpers (and quite ugly) :
<head>
<script type="text/javascript" src="/javascripts/json2.js"></script>
<script type="text/javascript" src="/javascripts/swfobject.js"></script>
</head>
<body>
<script type="text/javascript">
swfobject.embedSWF("/open-flash-chart.swf", "my_chart", "350", "200", "9.0.0");
</script>
<script type="text/javascript">
function ofc_ready()
{
alert('ofc_ready');
}
function open_flash_chart_data()
{
alert( 'reading data' );
return JSON.stringify(data);
}
function findSWF(movieName) {
if (navigator.appName.indexOf("Microsoft")!= -1) {
return window[movieName];
} else {
return document[movieName];
}
}
var data = <%= @chart.to_s %>;
</script>
<p>Hello World</p>
<div id="my_chart"></div>
</body>In this example you need the json2.js library that you can find here. However notice that Pullmonkey uses directly the json capabilities of Rails which is a much better way.
This code works, you can check it out here.
Thanks to Pullmonkey ! H
Posted in Ruby on Rails | no comments |
A Rails/OFC/Ajax example
Following this nice work from Pullmonkey, here is a small example on how to use OFCII to dynamically load a chart. We will display a line chart and then dynamically add one more line.
Controller code (test_it_controller.rb):
class TestItController < ApplicationController
def index_js_3_line
title = Title.new("Multiple Lines")
data1 = [5, 3, 4, 1, 3, 2, 5, 4, 3, 3]
data2 = [12, 9, 9, 7, 8, 8, 9, 9, 8, 9]
data3 = [16, 14, 17, 18, 14, 15, 16, 18, 15, 15]
line_dot = LineDot.new
line_dot.text = "Line Dot"
line_dot.width = 4
line_dot.colour = '#DFC329'
line_dot.dot_size = 5
line_dot.values = data1
line_hollow = LineHollow.new
line_hollow.text = "Line Hollow"
line_hollow.width = 1
line_hollow.colour = '#6363AC'
line_hollow.dot_size = 5
line_hollow.values = data2
line = Line.new
line.text = "Line"
line.width = 1
line.colour = '#5E4725'
line.dot_size = 5
line.values = data3
y = YAxis.new
y.set_range(0,20,5)
x_legend = XLegend.new("MY X Legend")
x_legend.set_style('{font-size: 20px; color: #778877}')
y_legend = YLegend.new("MY Y Legend")
y_legend.set_style('{font-size: 20px; color: #770077}')
chart = OpenFlashChart.new
chart.set_title(title)
chart.set_x_legend(x_legend)
chart.set_y_legend(y_legend)
chart.y_axis = y
chart.add_element(line_dot)
chart.add_element(line_hollow)
@chart = chart
end
def some_server_data_line
title = Title.new("Multiple Lines")
data1 = [5, 3, 4, 1, 3, 2, 5, 4, 3, 3]
data2 = [12, 9, 9, 7, 8, 8, 9, 9, 8, 9]
data3 = [16, 14, 17, 18, 14, 15, 16, 18, 15, 15]
line_dot = LineDot.new
line_dot.text = "Line Dot"
line_dot.width = 4
line_dot.colour = '#DFC329'
line_dot.dot_size = 5
line_dot.values = data1
line_hollow = LineHollow.new
line_hollow.text = "Line Hollow"
line_hollow.width = 1
line_hollow.colour = '#6363AC'
line_hollow.dot_size = 5
line_hollow.values = data2
line = Line.new
line.text = "Line"
line.width = 1
line.colour = '#5E4725'
line.dot_size = 5
line.values = data3
y = YAxis.new
y.set_range(0,20,5)
x_legend = XLegend.new("MY X Legend")
x_legend.set_style('{font-size: 20px; color: #778877}')
y_legend = YLegend.new("MY Y Legend")
y_legend.set_style('{font-size: 20px; color: #770077}')
chart =OpenFlashChart.new
chart.set_title(title)
chart.set_x_legend(x_legend)
chart.set_y_legend(y_legend)
chart.y_axis = y
chart.add_element(line_dot)
chart.add_element(line_hollow)
chart.add_element(line)
render :text => chart.to_s
end
endAnd in the view (index_js_3_line.html.erb):
<html>
<head>
<%= javascript_include_tag :defaults, 'swfobject' %>
</head>
<body>
<%= @chart.js_open_flash_chart_object("my_chart_js_1", 550,300) %>
<br/><br/>
<%= @chart.link_to_ofc_load("Load Original Chart", "my_chart_js_1") %> ||
<%= @chart.link_to_remote_ofc_load("Load Chart from server data", "my_chart_js_1", "/test_it/some_server_data_line") %>
</body>
</html>You can see this example in live here : http://www.thinkosphere.com/test_it/index_js_3_line.
Actually there is some “cheating” involved. Indeed we simply load a first chart and then reload a new chart identical with one more line. Next step is to load once the whole graph and to dynamically modify the JSON Data to display one line or another.
H
Posted in Ruby on Rails | no comments |
Ranking rankings
Web 2 is a lot about grading and ranking. So I guess it is logical that bloggers themselves get ranked. However there are dozens of ranking systems. Thus bloggers get their revenge: they can rank the ranking systems !
Ouriel Ohayon made a great post (in French) here and he asks the following :
Which ranking is, according to you, the most meaningful ?
You can answer below:
As I am coding the poll website thinkosphere.com you probably already know that I am a huge fan of internet polls, even if they currently lack too many features. Thanks to this post I discovered one more lacking feature : publishing a poll in several languages. I do not know about a poll engine offering this capability. I guess I will have to do it myself !
H
Posted in Software | no comments |
2 tricks for Firefox, 1 for KDE
I noticed these nice firefox 3 features haphazardly :
On the tab bar :
you can duplicate a tab thanks to a ctrl+click
you can move the tabs left or right using your mouse scrolling button
By the way, one thing I do not understand for Firefox is why open new tab does not open your start page ?
1 trick for KDE
Right click on a window name bar and you have the option to keep the window above others. That is nice to do some copy/paste from one page to a notepad or also to keep the command line while typing code in an IDE….
Posted in Linux | no comments |
Some News and Tech Links about Ruby and Rails
Some News and Tech Links about Ruby and Rails
You are looking for info about Rails ? Here are some useful links.
News
Railsinside
Rubyinside
Railsenvy
Nuby on rails
locomotivation
peepcode
Stone age blog (in French)
I assume you already know the official website.
API
http://api.rubyonrails.org/
http://www.ruby-doc.org/core-1.8.6/index.html
http://start.gotapi.com/
http://www.railsbrain.com
NB Some people find api.rubyonrails.org hard to use. I just use the google toolbar to make a “search on this website” and I get the info I was looking for in 0.1 sec. Equivalently you can search on google using site:api.rubyonrails.org.
Book
http://pragprog.com/titles/rails3/agile-web-development-with-rails-third-edition
Posted in Ruby on Rails | no comments |
Tile windows on Linux
In the same kind of ideas as my post on 2 monitors, it would be great to be able to tile windows under Gnome or KDE. Some people thought about it as some softs do it : whaw or a compiz plugin (but using compiz to do that is really an overkill).
Posted in Software | no comments |
Ubuntu Global Bug Jam in Toulouse
I went yesterday night to the Ubuntu Global Bug Jam. The session in Toulouse was organized by Christophe Sauthier, Ubuntu-Fr association president and toulibre association. Many thanks to them !
Posted in Software | no comments |
Wifi on Linux
I installed Kubuntu Feisty about one year ago. That was my first Linux installation. Since then I got plenty of troubles with my (pci) wifi card a WMP54G with a ralink rt61 chipset. But the most surprising is that each time you update the ubuntu version you need to setup again but differently your wifi network. My first advice is use a wirewith connection as much as you can. My second advice is if you have a rt61 chipset just change it. A wireless card is not that expensive. I should have done that one year ago, I would have avoided many troubles. Under Feisty Fawn after some work the wifi was perfectly working in wpa. With Gutsy Gibbon it was working ok but only in wep. And with Hardy Heron, it is working in wep but I still have some weird problems. The wifi card does not wake up from suspend ot hibernate and if my router is rebooted I cannot connect. In all cases I need to reboot. Here is my configuration.
Posted in Hardware | no comments |
Installing Typo : trackbacks and markup
After installing Typo 5.1.2, I had some troubles with mail capabilities. My second problem came from the trackbacks. Typo should add a trackback link at the end of an article (see below "Use the following link to trackback"). However, this link was not added even if the "allow trackbacks" option was activated in Typo.After some more debugging, it simply appeared that this was due to the theme. I had downloaded a new theme (techblue) but this theme like others at typogarden are not updated for Typo 5.
A beginning of solution is to copy all files from themes/typographic/articles to themes/techblue/articles.
Another question I had is how to use Markdown or textile markups with Typo. I was using the default mode to write content but actually you need to be in source mode.
Posted in Software | no comments |
