Sometimes, you may want to combine two files in a way that the output makes even more sense.
If you are on Linux, and are looking for a tool that can help you in situations line these, you may want to check out join, which is a command line utility. In this tutorial, we will discuss this command using some easy to understand examples.
from https://is.gd/cdkdNJ
Selected by Galigio via Computer Borders
Do you ever know that Linux is not just for serious work for admins and professionals, but you can play word games, speak to your Linux terminal or create beautiful ASCII pictures etc.? Yes, Linux is really fun, if you know the correct commands.
from https://is.gd/5Mn4DX
Selected by Galigio via Computer Borders
Since the Ubuntu 12.04 LTS the hibernate icon disappeared as possible option at the shutdown. It is not a big loss if you are not used to use (or overuse) it as I often do. Personally I think that the hibernate feature is really useful when you want to freeze your computer maintaining all the windows -and the work- you are working on at a precise moment.
After a kernel update, you find the start-up menu populated with extra lines related to all the old kernel versions plus the current one. To manage the start-up manager and safely remove old kernels you have to manually operate on it.
First of all you have to double-check what is the current kernel version.
Open a Terminal and type:
uname -r
The result will be something similar to: 2.6.32-35-generic
Then you will go to the boot directory through the command:
cd /boot ls vmlinuz*
The next step will be to obtain more information about old kernel you have on our PC:
ls vmlinuz*
Now in the Terminal you have results similar to these:
vmlinuz-2.6.32-21-generic vmlinuz-2.6.32-25-generic vmlinuz-2.6.32-35-generic
vmlinuz-2.6.32-24-generic vmlinuz-2.6.32-26-generic
As last step you have to remove all the old version of the kernel using this command:
sudo apt-get remove linux-image-X.X.XX-XX-generic
where “x” is the obsolete kernel version you want to purge. In my specific case the proper command line I used was:
sudo apt-get remove linux-image-2.6.32-21-generic linux-image-2.6.32-24-generic linux-image-2.6.32-25-generic linux-image-2.6.32-26-generic
Last but not least go to System –> Administration –> StartUp Manager (available for installation on Synaptics or on Ubuntu Software Center) and select your OS choice in the Default Operating System menu. That’s all! 
Conky is one of the most powerful and versatile system monitors for Linux desktops. It allows you to monitor and display all the information about your hardware, top processes, network, emails and more. At the moment more than 300 different feature has been built for Conky and searching on the web you always find the perfect feature already developed by someone.
– Installation on Ubuntu:
in Terminal run: sudo apt-get install conky
– Configuration:
In Terminal run: sudo nautilus
Go to File System: /etc/conky/conky.conf
Save a copy of the original conky.conf in another location and open the original file with Gedit Text Editor
First of all change: own_window yes to own_window no
Choose your preferred alignment (some samples below…):
alignment top_right
or
alignment middle_right
or
alignment bottom_right
Play with: update_interval 1.0
and change the interval value till you find the right ratio to obtain the best speed for you (in my case it was 0.80).
Add this line to eliminate any flickering:
double_buffer yes
but, on some computers, all the icon on your desktop will be hidden and you need to use (move) the mouse to discover them if you will not add this parameter: own_window_type normal
Add, as last line (or in other position if you prefer):
${color red} ${cpugraph} to have a clear graph about cpu (obviously you can choose the color you prefer)
For automatic start of Conky at startup, please follow the following instructions:
Run Startup Applications in System –> Preferences
Click on Add and save after updating the following instructions
Name: Conky
Command: /usr/bin/conky
Restart Ubuntu to check your new Conky “applet”
Link to Conky: http://conky.sourceforge.net/
For more info about Conky’s variables: http://conky.sourceforge.net/variables.html
Find online some pre-compiled Conky configuration files, searching, for example, on: http://gnome-look.org
Do you want to maximize your bandwidth? Here are few important settings you should do to speed up your internet and it works in Ubuntu and all Linux operating system via sysctl.
First open a Terminal via Applications->Accessories->Terminal
Type:
sudo gedit /etc/sysctl.conf
Then Paste the Following at the end of the file:
# increase TCP max buffer size setable using setsockopt()
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
# increase Linux autotuning TCP buffer limits
# min, default, and max number of bytes to use
# set max to at least 4MB, or higher if you use very high BDP paths
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
# don’t cache ssthresh from previous connection
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_moderate_rcvbuf = 1
# recommended to increase this for 1000 BT or higher
net.core.netdev_max_backlog = 2500
# for 10 GigE, use this, uncomment below
# net.core.netdev_max_backlog = 30000
# Turn off timestamps if you’re on a gigabit or very busy network
# Having it off is one less thing the IP stack needs to work on
#net.ipv4.tcp_timestamps = 0
# disable tcp selective acknowledgements.
net.ipv4.tcp_sack = 0
#enable window scaling
net.ipv4.tcp_window_scaling = 1
Press Ctrl-S to save, then alt-F4 to exit and then type:
sudo sysctl -p
to apply the settings.
Now, check your speed using speed-test site or download files in the net.
You can disable all these settings by removing these lines you added via:
sudo gedit /etc/sysctl.conf
Hay veces que queremos instalar alguna aplicación y no sabemos muy bien cuales son los repositorios correctos PPA de Launchpad. gracias a PPASearch esto se hace todo muy muy fácil. Lo primero que hay que hacer es instalar esta aplicación en nuestra Distro con los siguientes comandos:
sudo add-apt-repository ppa:wrinkliez/ppasearch
sudo apt-get update && sudo apt-get install ppasearch
Cuando ya tengamos instalada esta aplicación, podemos buscar el repositorio que mas nos interese, para hacer eso lo único será ejecutar PPASearch y el nombre del programa de lo cual buscamos el repositorio: ejemplo
ppasearch skype
Buscando por los repositorios de Skype me salieron diferentes repositorios y cada uno identificado con un numero, para instalar alguno de ellos, lo único será elegir el numero correspondiente y PPASearch se ocupará de instalar el repositorio seleccionado. ¡Muy buena herramienta!
Agradezco mucho el Blog Ubuntulife por su labor y por todas las informaciones y ayuda incluida esa entrada http://ubuntulife.wordpress.com/
This week, in our Linux Page (in Spanish), we posted some lines about editing and changing the feed/podcast reader on Firefox when you have previously chosen a specific program to automatically subscribe to podcasts. If you are using Firefox 3.5 on Linux, you can simply go to Edit -> Preferences and type Feed in the search bar. At this point you have a button menu with all the different options; we suggest to select the Preview in Firefox one. If you have an older version of Firefox that does not allow you to follow the above path (or for some reason, by default, you prefer the most difficult way) you have to open a new Tab and type about:config in it. After a brief warning message you can type Feed in the location bar and find the browser.feeds.handler line. At this point it is necessary to change the value field to Ask and next time you will decide to subscribe a podcast you will free to choose your favourite program. We hope this few lines could be useful and easy to execute for you all!
This week, in our Linux Page (in Spanish) we posted some tips about repairing a bad Linux upgrade. In fact, it is rare but sometimes, unfortunately, it happens. I mean one or more error during an upgrade installation on Ubuntu. In my case the problem was caused by a blackout and a battery which did not worked properly. When I restarted the PC it worked only in text mode and it asked me the login and the password to enter into the Ubuntu root mode. Obviously, as usual, I typed the requested data and then, after reading how to solve similar problems on internet, I decided to go forward with sudo apt-get update. At this point Ubuntu advised me that something had been wrong during the last update and suggested to try with sudo dpkg –configure -a. I followed the suggestions and I concluded the “repair session” with sudo apt-get upgrade –fix-broken. Fifteen minutes later and after rebooting all the “bad upgrade” problems were solved. Recommended!
Today , in our Linux Page (in Spanish) we posted a brief review about installing Ubuntu Tweak and Moblock on Ubuntu 9.04. We have read different websites on these topics but the best are the official ones that we advise you to visit them:
http://ubuntu-tweak.com/downloads for Ubuntu Tweak and
http://moblock-deb.sourceforge.net/ for Moblock.
Ubuntu Tweak is the most flexible graphical interface to configure desktop and system options on your Jaunty. On the other side,Moblock is a powerful software to protect your privacy when you surf internet and it is based on a huge list of IP address which are not considered as friendly.
We strongly believe that the most efficient solution is to add the sources on your Software Sources (System – Administration – Software Sources); for Ubuntu Tweak:
1 – using Terminal, import the key sudo apt-key adv –recv-keys –keyserver keyserver.ubuntu.com FE85409EEAB40ECCB65740816AF0E1940624A220
2 – import the source on the Software Sources
deb http://ppa.launchpad.net/tualatrix/ubuntu jaunty main
deb-src http://ppa.launchpad.net/tualatrix/ubuntu jaunty main
3 – install Ubuntu Tweak (using Terminal)
sudo apt-get update
sudo apt-get install ubuntu-tweak
To add Moblock in your sources it is necessary:
1 – import the keys, using Terminal
gpg –keyserver keyserver.ubuntu.com –recv-keys 9C0042C8
gpg –export –armor 9C0042C8 | sudo apt-key add –
2 – import the source on the Software Sources
deb http://ppa.launchpad.net/jre-phoenix/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/jre-phoenix/ppa/ubuntu jaunty main
3 – install Moblock (using Terminal)
sudo aptitude update
sudo aptitude install moblock blockcontrol mobloquer
Computer Borders 