May 27, 2013 ademcan No comments

Keep SSH connection alive in OSX

Keep SSH connection alive in OSX
    If you want to keep you SSH connection alive to avoid automatic disconnections it is very easy in OSX.
Open your terminal and run the following command:

cd ~/.ssh

Check if you have a file named “config”. If not, run:

touch config 

to create the config file. Then, add the following line in the “config” file

ServerAliveInterval 60

With this command, the client (your computer) will send a null packet to the server every 60 seconds, thus keeping the SSH connection alive.
Enjoy your ∞ connection… 😉

Source: New feed

May 11, 2013 ademcan No comments

Add sub-domains to your server with Apache

Add sub-domains to your server with Apache
    If you have multiple services running on your server, and want to use sub-domains instead of sub-folders, here is a quick howto 😏
    I am running different services on my server at home, for example Shaarli and Leed. Instead of using different sub-folders of the main Apache /var/www/ folder, I preferred to use sub-domains. With sub-domains you obtain something like :
links.domain.com instead of domain.com/links
    To do so, you have to edit a file in the Apache configuration. In Ubuntu, the file is located under

/etc/apache2/sites-availabe/

Open the file named “default” with your preferred text editor and add the following lines at the end of the file

<VirtualHost *:80>
DocumentRoot /var/links/
ServerName links.domain.com
</VirtualHost>

The folder /var/links/ represent the installation folder of Shaarli.
Then, restart your Apache server

sudo /etc/init.d/apache2 restart

open your browser to links.domain.com
Enjoy ✅

Source: New feed

April 16, 2013 ademcan No comments

Blogotext’s Links, new section on the blog

Blogotext’s Links, new section on the blog
    I usually like to write detailed articles on my blog. However it often happens that I want to share a quick note, for example a basic command. In this situation, I am not going to write a complete article about how to use this command. That’s why I decided to use Blogotext’s (BT) Links as a links/notes sharing platform. BT Links is similar to Shaarli (installed on my own server for personal use).
    Here, I preferred BT Links instead of Shaarli because it fits better with my blog. I can manage my links from the blog’s admin page, the graphical chart remains the same as on my blog and it is easier to use. From now on, you can follow my links/notes from my Links page, or using your favorite RSS reader from my Links RSS feed.
    I hope you’ll enjoy 😉

Source: New feed

April 14, 2013 ademcan No comments

Installing RStudio Server on Mac OS X Lion

Installing RStudio Server on Mac OS X Lion
RStudio.png
    RStudio is a great IDE for the R programming language. Two versions of RStudio are available, the desktop and the server edition. The desktop edition is a full version running locally and the server edition is running on a server with the graphical RStudio interface accessible from your web browser. At work I am using a Mac Pro as a personal server with all my data and my running scripts. To preserve my memory (RAM) on my laptop I wanted to run R from my server. Until now, I used the command line with ssh, but after testing RStudio I couldn’t go back anymore ðŸ™‚
    You can install RStudio Server in any machine and access its graphical interface from any web browser. You will then access your normal IDE running R (on the server-side) with your Rhistory and R plots remaining there.
    Recently, I found the following tutorial about how to install RStudio server on Mac OS X Lion. It works very well, but I got an error at some point. After running the following command

sudo ./install-boost

    I got an error claiming that bootstrap.sh was not found. To continue the installation, you need to run bootstrap.sh by yourself. To do so, run the following commands from your terminal

cd $YOUR_RSTUDIO_INSTALLATION_FOLDER/dependencies/common/boost-build/boost_1_50_0
sudo ./bootstrap.sh
sudo ./bjam --prefix=/opt/rstudio-tools/boost/boost_1_50_0 toolset=clang variant=release threading=multi link=static install

    Of course, change the version of boost if your are using a more recent one. Don’t forget to modify $YOUR_RSTUDIO_INSTALLATION_FOLDER by your Rstudio installation folder path.
Then, continue with the normal installation process, everything should go well.
    Browse to http://localhost:8787 login with your username and password you use for the computer where you installed RStudio server and enjoy 😉

image: rstudio.org

UPDATE: Opera is not supported by RStudio BUT works with IE if you install the Google Chrome Frame plugin. OMG ðŸ™‚

rstudioError.jpg

Source: New feed

April 10, 2013 ademcan 5 comments

How to convert PDF to PNG from the command line on a Mac

How to convert PDF to PNG from the command line on a Mac
    Instead of opening your PDF file with the Preview app (or other PDF reader) and export it to PNG, you can easily use the command line.
To do so, you need to use the sips (scriptable image processing system) command installed by default in Mac OS X. Open your terminal and run:

sips -s format png your_pdf_file.pdf --out your_png_file.png

The script also works for the jpeg format the same way.
Voilà 😉
UPDATE: this solution works for the first page of the PDF only (thanks Joe Papa for the feedback).


source
 : straylink
A.P. Lawrence

Source: New feed

April 7, 2013 ademcan No comments

Add tabulations in your articles with Blogotext

Add tabulations in your articles with Blogotext

    I am using Blogotext as blog engine. It is a big pleasure to use it ðŸ™‚ Blogotext is open-source, easy-to-use and very light, it works very well. I would like to thank again Timo for his great job.
    I am using paragraphs to organize my articles and make them clearer. In addition, I like to start each paragraph with a tabulation. Unfortunately, it is not easy to add tabulations using the default Blogotext editor. However, you can do it by forcing 4 spaces, such as

&nbsp;&nbsp;&nbsp;&nbsp;

    I wanted to make it easier, thus I decided to implement this option in my editor.
The default Blogotext editor’s menu looks like :
BlogotextEditorWithoutIndent.jpg
After implementing the tabulation option, you’ll see an “indent” icon in the right-hand side of the “line-through” icon :
BlogotextEditorWithIndent.jpg

    To do so, you will have to modify two lines in two different files:

1 – First,

  • open the file /admin/form.php
  • go to line 581
  • add
    echo "t".'<button id="button15" class="but" type="button" title="tab" onclick="insertTag('&nbsp;&nbsp;&nbsp;&nbsp;','','contenu');"><span class="c"></span></button>'."n";

2 – Second,

  • open the file /admin/style/style-ecrire.css
  • go to line 184
  • add
    #button15 span.c { background-image: url("format-bbcode/edit-indent.png"); }

If you want, you can modify the icon by choosing another one from your /admin/style/format-bbcode/ folder.
Enjoy 😉

Source: New feed

April 6, 2013 ademcan No comments

HyperSwitch, an interesting app switcher alternative for Mac

HyperSwitch, an interesting app switcher alternative for Mac

HyperSwitch.png
    The default app switcher on Mac (cmd+tab) doesn’t show the different opened windows for a given application. For example if you have multiple LibreOffice windows opened, you will only see one LibreOffice icon on the app switcher. I think this is a great productivity-killer ðŸ™‚
    When I was looking for an alternative, I first found Witch. Witch looks promising but it was too complicated for me. I also didn’t like the vertical presentation of the app switcher.
    I then managed (I don’t know how) to find Senebier ðŸ™‚ I just don’t understand what’s written and didn’t read any positive or negative comment about this app. I didn’t installed it yet, but I contacted the author to ask if the source code will be available at any time or not.
    Finally, when following my feeds from LifeHacker, I stumbled upon an article about HyperSwitch. This app switcher is still in Beta but it actually works pretty well. Once you started the app switcher and moved to an app icon, you can:

  • press the down arrow to you see all the open windows and switch to one of them
  • press the up arrow to open a new window for that app or see the most recent files

    I am actually giving a try to HyperSwitch. It is a promising project, still in beta, but I am sure it will improve a lot very soon.

Source : HyperSwitch website
LifeHacker’s article about HyperSwitch
Image : RoaringApps

Source: New feed

April 3, 2013 ademcan No comments

Leed: your web-based open source RSS reader

Leed: web-based open source RSS reader

Leeds logo
    As you can see from my older posts, I am becoming more and more self-hosted every day ðŸ™‚ I already have some interesting services running on my own server, don’t worry I will write about all of them. Last time I wrote about Shaarli, a great and open source links managing tool. Today, I will introduce you to Leed (for Light Feed). Leed is an open source RSS reader alternative to Tiny Tiny RSS or RSS Lounge for example (and the almost dead Google Reader). I never tried any RSS readers before, I was mainly reading my feeds in Thunderbird, thus I cannot compare Leed to its existing alternatives. I can only say that Leed is great.

    I wanted a web-based RSS reader to access my feeds from any devices everywhere. I recently discovered Idleman’s blog (in French) when he started his tutorials about the Raspberry Pi. Then I found his project’s page and Leed.
Leed is an open source and light RSS feed reader. The installation is very easy.
The “only” requirements are:
– Apache server
– PHP 5.3
– MySQL

    Once installed, you can use crontab to automatically update your feeds, or you can do it manually if you don’t want to deal with crontab. You can use keyboard shortcuts and personalize the interface using themes. You can easily implement your own themes. The default theme is responsive, thus you have an easy access and user-friendly interface in any of your devices (tablet, smartphone…).
One other great option is the link between Leed and Shaarli. If you are using Shaarli, you can automatically add any articles from your feeds to your Shaarli.
Leed is very simple and Leed works ðŸ™‚

When I was writing this post, I realized that Leed was only available in French. After asking the permission to the author (Idleman), I translated Leed and the installation process to English.

How to install Leed:
1 – Download the archive LeedEnglish.zip (Licence : CC by nc sa)
2 – Unzip and send the content to your server. Do a chmod 777 to the leed folder
3 – Go to the installation page http://mydomain.com/leed/install.php and follow the instructions
4 – Once the installation is finished, remove the install.php file for your security
5 – If you want to update automatically your feeds, put the following line into your crontab
Open crontab

sudo crontab -e

and add the following line for an hourly update :

0 * * * * wget -q -O /var/www/leed/logsCron "http://mydomain.com/leed/action.php?action=synchronize&code=your_synchronisation_code"

(adjust the link and your synchronisation code)
Be warn that too frequent updates can slow down the server.

Don’t hesitate to ask if you have any question or remark 😉

A demo of Leed is available online here

Source: New feed

March 30, 2013 ademcan No comments

Dynamic IP address with OVH

Dynamic IP address with OVH

When I was configuring my server, I realized that I only had a dynamic IP address. At the time I had two options:

  • ask for a fixed IP address
  • deal with my dynamic IP address to get it updated when it changes

The first option was too expensive for me. Thus, I decided to go for the second one.

    Some tools exist to allow you to use a dynamic IP address with a specific domain name, such as DynDns or no.ip for example. Those tools provide scripts to update your IP address as soon as it changes. I could’t find the free option for DynDns anymore, but there is a free option for no.ip with some limitations, but it should be find for a personal use.
    Before using one of the available general tools, I did some research about OVH (my registrar) and dynamic IP address. I then realized that OVH was providing some specific tools to update your IP information directly on your OVH manager. You can find more information in the DynHOST page.
    I am actually using the Ipcheck.py script available from the previous link. I just had to adapt the script for my own usage. I modified the dynhost script and changed the line

IP=`/sbin/ifconfig $IFACE | fgrep "inet ad" | cut -f2 -d":" | cut -f1 -d" "` 

(which was returning my local IP address)
to

IP=`/usr/bin/wget -qO- ipecho.net/plain`

to get the correct IP address used by OVH.
It actually works pretty well for me, Enjoy cool

Source: New feed