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How to Use Swap in Ubuntu ?

You can always create swap file

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by imaginestudio repository

To add more swap space. This is not same (in every aspect) as swap partition but it will be easy and dynamic.

Change /media/fasthdd/swapfile.img to anything you like, for example it can be /swap.img as well. /media/fasthdd/swapfile.img is just example filename, if you are using this one then of course there must be directory /media/fasthdd/ with enough free space for your new swap file.

Use any of terminal applications to run commands. All command should be run with root privileges, to do this you can either add sudo to beginning of every command or run sudo bash before running commands.

1. Create empty file:
This file will contain virtual memory contents so make file big enough for your needs. This one will create 1Gb file which means +1Gb swap space for your system:

dd if=/dev/zero of=/media/fasthdd/swapfile.img bs=1024 count=1M  

If you want to make 3Gb file then change count value to count=3M. See man dd for more information.

2. Bake swap file:
Following command is going to make "swap filesystem" inside your fresh swap file.

mkswap /media/fasthdd/swapfile.img  

3. Bring up on boot:
To make sure that your new swap space is activated while booting up computer you should add it to filesystem configuration file /etc/fstab. Add it to end of file, this is recommended because other filesystems (at least one that contains swap file) must be mounted in read-write mode before we can access any files.

# Add this line to /etc/fstab  /media/fasthdd/swapfile.img swap swap sw 0 0  

4. Activate:
You can either reboot your computer or activate new swap file by hand with following command:

swapon /media/fasthdd/swapfile.img  

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If everything goes well

you should see that more swap space is available for use. You can use following commands to check your new swap and confirm that it is active:

cat /proc/swaps    Filename                           Type       Size    Used    Priority    /media/fasthdd/swapfile.img        file       8388604 2724    -1    grep 'Swap' /proc/meminfo    SwapCached:         4772 kB    SwapTotal:       8388604 kB    SwapFree:        8355812 kB  

How add new/otherJava Versions in linux

 just download the java( tar.gz files) which you want  install in linux

extract that  for example:

I have downloaded the Jdk1.7.tar.gz for 64 bit,placed on the opt/local

follow:

ln -s jdk1.7.0 newjava

then edit the  profile file and add the following linesat bottom

vi /etc/profile

export JAVA_HOME=/opt/local/newjava
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/jre/lib:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar

How do I cleanup temp files Ubuntu?

Ubuntu software packaging system can accumulate unused packages or temporary files. These temporary files, also called caches, contain package files from all of the packages that you have ever installed. Eventually, this cache can grow quite large. Removing them allows you to reclaim space on your computer's hard drive for storing your documents, music, photographs, or other files.

To clear the cache you can use either the clean or the auto-clean op for a command-line program called apt-get. The clean command will remove every single cached item, while the auto-clean command only removes cached items that can no longer be downloaded (these items are often unnecessary).

To run clean go to Applications --> Accessories --> Terminal and Type

    $ sudo apt-get clean

and it will ask password and give the password

packages can also become unused over time. If a package was installed to assist with running another program- and that program was subsequently removed-you no longer need the supporting package. You can remove it with autoremove

Terminal and Type

    $ sudo apt-get autoremove

it will remove the unnecessary packages.

How-To: Compile and Install Wine in Ubuntu

In order to compile Wine from source and install it on Ubuntu, you will only need to follow several easy steps I list below:

1. Enable the sources repositories
Make sure you have a line in the /etc/apt/sources.list file which says something like:

deb-src http://archive.

ubuntu.com/ubuntu hardy main restricted universe multiverse

Next, update the packages list:

sudo apt-get update

2. Install the Wine dependencies
This will also install the build-essential meta package if it's not already installed:

sudo apt-get build-dep wine

3. Download the Wine 1.1.4 source tarball, compile and install
Download the source from the official website (direct link here), uncompress it, change the current working directory to wine-1.1.4 and type the command:

./tools/wineinstall

If the configuration goes smooth, you'll be presented with a message similar to the one below:

configure: Finished. Do 'make depend && make' to compile Wine.


We need to install wine as root user, do you want us to build wine,
'su root' and install Wine? Enter 'no' to continue without installing
(yes/no)

Type no, wait for Wine to be compiled, then use:

sudo make install

To install Wine.

4. Run Wine
Run winecfg as normal user in order to configure it, then use it like wine WIN_APP.EXE in order to start Windows applications. You can see where the binary was installed by typing:

whereis wine

And to see the version:

wine --version

This should be all.

Resources
Wine homepage
Wine applications database
 

Wine Installetion

Installing the Flash plugin manually

Go to the Flash Player download page at Adobe.com.
When prompted, save the file (i.e.
install_flash_player_"version"_linux."processor".tar.gz).
At the top of the Firefox window, click on the File menu and select Quit
Open a Terminal window (in Gnome, click on the Applications menu,
select Accessories, and then select Terminal.)

In the Terminal window, change to the directory where you saved
the file you downloaded (e.g. cd /home/user/Downloads).

Extract libflashplayer.so from the file you downloaded with the command

tar -zxvf install_flash_player_"version"_linux."processor".tar.gz.

As the super user, copy the extracted file, libflashplayer.so, to
your Firefox installation directory's plugins sub-directory. For
example, if Firefox is installed in /usr/lib/mozilla, use the command

sudo cp libflashplayer.so /usr/lib/mozilla/plugins

and then enter your super user password when prompted.

Install Tomcat on a Linux Server

This article walks you through installing Tomcat on your Linux server. This has been tested on a Linux server with Cent OS release 5.5 (Final) and no control panel (e.g., Plesk or cPanel).  These instructions were performed with Tomcat 7.0.10. This only applies to Cloud and Dedicated accounts.  You can view more information about these account types at http://www.hosting.com/services/platform-services.

1. Obtain a tarball (.tar.gz) of the latest stable release of Tomcat from http://tomcat.apache.org/ and place it in /usr/local/ on your Linux server. For example, you might run something like this at command prompt on your Linux server.
   
           wget http://www.bizdirusa.com/mirrors/apache/tomcat/tomcat-7/v7.0.10/bin/apache-tomcat-7.0.10.tar.gz


2. Extract the tarball by running a command similar to the following:
   
            tar -xvzf apache-tomcat-x.x.x.tar.gz (x.x.x is the version of Tomcat you obtained in step 1 above)


3. Create a symbolic link.  The LINK NAME will be Tomcat and the TARGET will be the path of the extracted folder you created in step 2. It may look something like this:
   
            ln -s /usr/local/apache-tomcat-7.0.10 ./tomcat


4. Run the following command:
   
           export CATALINA_HOME=/usr/local/tomcat


5. Add the following lines to your /etc/profile file. It will set the CATALINA_HOME variable automatically if the system restarts.
   
   


6. Install the latest stable release of the Java JDK. You can obtain this at http://www.oracle.com/technetwork/java/javase/downloads/index.html.This should be placed into /usr/java/jdkx.x.x_xx (the x's will be your version number).


7. Run the following command:
   
           export JAVA_HOME=/usr/java/jdk1.6.0_23 (The 1.6.0_23 you should replace with your version of the JDK you installed in Step 6.


8. Add the following lines to your /etc/profile file. It will set the JAVA_HOME variable automatically if the system restarts. Replace the 1.6.0_02 with your version.
   
   


9. Run the following command to start the Tomcat server:
   $CATALINA_HOME/bin/startup.sh


10. If you obtained any errors on the starting of Tomcat, please review the _ log to resolve those issues. Once those issues are resolved, proceed to step 11.


11. Verify that the Tomcat server is running by browsing to http://Your_IP_Here:8080/