editing the environmental path
sudo gedit /etc/environment
installation of jdk in ubuntu
sudo apt-get install sun-java6-bin sun-java6-jrehttp://www.cyberciti.biz/faq/howto-ubuntu-linux-install-configure-jdk-jre/
You can use either kchmviewer or gnochm or xchm. This is to view .chm files
kchmviewer from KDE:
  Code:
  sudo aptitude install kchmviewer
  gnochm from Gnome:
  Code:
  sudo aptitude install gnochm
  xchm:
  Code:
  sudo aptitude install xchm
  change samba password
sudo smbpasswd -a 'myusername'  meta name="GENERATOR" content="OpenOffice.org 2.2  (Linux)">
                How can i change Grub Menu?
 Ok. First you need to open the grub configuration file for editing. To do this, open a terminal window (I have it un Applications/Accessories, but I think it was in Applications/System tools in breezy), type 'sudo gedit /boot/grub/menu.lst', and enter your password.
 
 All the lines with a # in beginning are comments, they are just to help you. All the important lines are those without a #. Now find a line like 'default 0'. That's where you select which OS will boot by default. You'll have to take a look at how many separate entries you have, and which one is windows. Most likely the first 2 are Ubuntu entries, and then there's memtest, and after that would be your windows. The first entry is number 0, second is 1 etc. So if windows was the 4th entry you have, change that 'default'-line to 'default 3', if it's sixth, use 'default 5'...
 
 If you set the line to 'default saved', grub will always default to the last used entry (if the entry has a line with 'savedefault'), so after running windows your machine would boot to windows by default, and after running Ubuntu it will boot to Ubuntu by default.
 
 
 sudo gedit /boot/grub/menu.lst
 
 Check for dependencies:
 
 sudo synaptic
 
 NVIDIA driver
 $ sudo apt-get install nvidia-glx nvidia-kernel-common
 $ sudo nvidia-xconfig
 Ctrl+Alt+Backspace
 
 
 Install newer modesetting Intel video driver
 
 Unfortunately the newer driver is only available from 6.10 onwards (Edgy, Feisty etc), but not in 6.06.1 (Dapper). If you have Edgy or above then you can install the newer intel video driver with:-
 
 sudo apt-get install xserver-xorg-video-intel  
 
 Then edit your /etc/X11/xorg.conf and change the
 
 Driver "i810"  
 
 to
 
 Driver "intel"  
 
 
 reconfigure the grapchics driver
 
 sudo dpkg-reconfigure -phigh xserver-xorg
 
 
tar xvfz xampp-linux-1.6.5a.tar.gz -C /opt 
 
 FTP CONFIGRATIONS
 sudo apt-get install vsftpd
 
 
 Step # 2: Configure /etc/vsftpd.conf
 The default vsftpd configuration file is /etc/vsftpd.conf. You need to edit this file using text editor such as vi:
$ sudo vi /etc/vsftpd.conf
 Add the following line (uncomment line) to the vsftpd configuration file:
local_enable=YES
Above config directive will allow local users to log in via ftp
 If you would like to allow users to upload file, add the following to the file:
write_enable=YES
 For security you may restrict local users to their home directories. Add the following to the file:
chroot_local_user=YES
 Save and close the file.
 
 sudo /etc/init.d/vsftpd restart
 
 
 rar file extractor
 use terminal
sudo apt-get install rar
sudo ln -fs /usr/bin/rar /usr/bin/unrar
Applications -> Accessories -> Archive Manager
or synaptic search rar install
 
 
 Permission
 sudo chown nirbhab -R  /opt/lampp
 
 sudo chgrp nirbhab -R  /opt/lampp
 
 sudo chmod 777 -R /opt/lampp
 
 
 
 HOWTO: Setup easy web development environment (XAMPP) http://joeabiraad.com/linuxunix/installing-lamp-on-ubuntu-710-linuxapachemysqlphp/100
 
 This is a how-to for setting up a web development environment easily. This guide will install the XAMPP lampp stack into /opt, setup an easy way to start it up and shut it down, and link a folder in your home directory to the webserver.
WARNING
This guide is aimed at a development environment only and should not be used as a public webserver. To setup a public webserver follow the directions on the Ubuntu wiki https://help.ubuntu.com/community/ApacheMySQLPHP
As this is Ubuntu, all the major parts of a typical web server are included (in the main repo, or on the Ubuntu Server CD) and this is a great way to setup a server. The ubuntu developers have prepared a great web server and have made the process as seemless as possible.
But what if even the official way is still to complicated? What if you just want a quick web server for development?
Fortunately there is the XAMPP project: http://www.apachefriends.org/en/xampp.html. The XAMPP project bundles Apache, PHP4 & 5, Perl, mySQL, and a bunch of other utilities/applications into an simple package for Mac OSX, Windows, Solaris, and Linux. Obviously this HOWTO only deals with the linux version.
For those of you with already existing Apache/mySQL/php installations it installs everything into /opt so it doesn't conflict with any other installation, and it is completely setup and ready to run.
Install XAMPP
Two easy steps:
 - Download the  most recent version of XAMPP: (at time of writing  1.5.3a)
 http://prdownloads.sourceforge.net/x...ar.gz?download
 (Source  URL: http://www.apachefriends.org/en/xampp-linux.html#374)
 
- Extract the archive to /opt  using sudo: (make sure you are in the directory that you downloaded  the archive to)    
 Code:
  sudo tar xvfz xampp-linux-1.5.3a.tar.gz -C /opt
 
Start XAMPP
To start it up, open a terminal and type this:
 Code:
  sudo /opt/lampp/lampp start
 Stop XAMPP
To stop it, open a terminal and type this:
 Code:
  sudo /opt/lampp/lampp stop
 Additional XAMPP commands
To see additional commands, open a terminal and type this:
 Code:
  sudo /opt/lampp/lampp
 Sweet XAMPP Control Panel
To use the sweet gtk/python control panel:
Run in a terminal:  
 Code:
  gedit ~/.local/share/applications/xampp-control-panel.desktop
 Paste the following into the open file and save and exit.
 Code:
  [Desktop Entry]
  Comment=Start/Stop XAMPP
  Name=XAMPP Control Panel
  Exec=gksudo "python /opt/lampp/share/xampp-control-panel/xampp-control-panel.py"
  Icon[en_CA]=/usr/share/icons/Tango/scalable/devices/network-wired.svg
  Encoding=UTF-8
  Terminal=false
  Name[en_CA]=XAMPP Control Panel
  Comment[en_CA]=Start/Stop XAMPP
  Type=Application
  Icon=/usr/share/icons/Tango/scalable/devices/network-wired.svg
 "XAMPP Control Panel" will show up in your applications menu under Internet. Use the Alacarte Menu Editor to move it around.
Test to see if XAMPP is running
Once XAMPP is up and running open firefox and go to: http://localhost/
You should see the XAMPP test page:
Location of files and uploading
XAMPP by default uses /opt/lampp/htdocs as the root web directory. The easiest way to start working on files is to link a folder in your home directory into this directory.
My user name is peter so I have /home/peter/public_html linked to /opt/lampp/htdocs/peter. So if I navigate to http://localhost/peter/ I get a listing of all the files/folders in that directory. (As long is there isn't a index.php/html/etc file)
To set this up, run in a terminal:
 - Make  public_html directory in home directory:    
 Code:
  mkdir ~/public_html
 - Link to  /opt/lampp/htdocs    
 Code:
  sudo ln -s ~/public_html /opt/lampp/htdocs/$USER
 Now any files and folders you place in ~/public_html will be published to your personal webserver.
Bookmark http://localhost/username to make this easy to access.
WARNING - SECURITY
http://www.apachefriends.org/en/xampp-linux.html#381
Open holes:
 - The MySQL  administrator (root) has no password. 
- The MySQL daemon is accessible via  network. 
- ProFTPD uses the password "lampp"  for user "nobody". 
- PhpMyAdmin is accessible via  network. 
- Examples are accessible via  network. 
- MySQL and Apache running under  the same user (nobody).    
This doesn't leave your whole system wide open, but someone could hack your XAMPP installation, so be wary.
To fix most of the security weaknesses open a terminal and run:  
 Code:
  sudo /opt/lampp/lampp security
 
 
 
        | Welcome to the Linux version of    XAMPP(on x86-compatible processors)
 By the way:    In the past this software was called LAMPP but to avoid    misconceptions we renamed it to »XAMPP for Linux«. So    if you are seeking for LAMPP you're on the right track. ;) If you encounter any problems with    XAMPP please feel free to get in touch with us. This will help us    to improve XAMPP and make it more useful for everybody.      | 
 
 
  
        | As the old saying goes, a picture is    worth a thousand words. Here you can take a look at some screen    shots of a XAMPP installation. Step 1: DownloadSimply click on    one of the links below. It's a good idea to get the latest    version. :) A complete    list of downloads (older versions) is available at SourceForge. A detailed overview over the changes    and contents of all XAMPP releases is available in the RELEASE    NOTES. | 
 
 
              | XAMPP for Linux 1.6.5a, 2007/12/25 | 
     | Version
 | Size
 | Notice
 | 
 | 
     | XAMPP    Linux 1.6.5a | 52 MB | Apache 2.2.6, MySQL 5.0.51, PHP 5.2.5 & 4.4.7 & PEAR +    SQLite 2.8.17/3.3.17 + multibyte (mbstring) support, Perl 5.8.7,    ProFTPD 1.3.1, phpMyAdmin 2.11.3, OpenSSL 0.9.8e, GD 2.0.1,    Freetype2 2.1.7, libjpeg 6b, libpng 1.2.12, gdbm 1.8.0, zlib    1.2.3, expat 1.2, Sablotron 1.0, libxml 2.4.26, Ming 0.3,    Webalizer 2.01, pdf class 009e, ncurses 5.8, mod_perl 2.0.2,    FreeTDS 0.63, gettext 0.11.5, IMAP C-Client 2004e, OpenLDAP    (client) 2.3.11, mcrypt 2.5.7, mhash 0.8.18, eAccelerator 0.9.5.2,    cURL 7.13.1, libxslt 1.1.8, phpSQLiteAdmin 0.2, libapreq 2.07,    FPDF 1.53, XAMPP Control Panel 0.6MD5 checsum:    ca9355ef857b00068aba21ce014422af
 | 
 | 
     | Upgrade    1.6.4 to 1.6.5a | 23 MB | Upgrade package. How    to upgrade?MD5 checksum:    9c0f4bad6a79747598d8e3aee6d03771
 | 
 | 
     | Upgrade    1.6.5 to 1.6.5a      | 0 MB      | Upgrade package. How    to upgrade?.MD5 checksum:    06f121cc6ec45a1f8accf6fee8a4d6b8
 | 
 | 
     | Development    package | 27 MB | The development package contains all files you need if you want    to compile other software packages for XAMPP by yourself and the    Unix manual pages. Install this package like the normal XAMPP    distribution:tar xvfz xampp-linux-devel-1.6.5a.tar.gz -C /opt
 MD5 checksum: 2c652233f28554463776b133563a06ef
 | 
 | 
 
 
        | Attention: If you download    these files on a Windows system and you're running McAfee virus    scanner you may get a false positive virus warning. This is a    problem with McAfee and gzip-compressed files, it should be    ignored. Step 2: InstallationAfter downloading simply type in the    following commands: Go to a     Linux shell and login as the system administrator root:
     su Extract     the downloaded archive file to /opt:
     tar xvfz    xampp-linux-1.6.5a.tar.gz -C /opt     Warning: Please use only this command to install XAMPP.    DON'T use any Microsoft Windows tools to extract the archive, it    won't work.     Warning 2: already installed XAMPP versions get overwritten    by this command. That's all. XAMPP is now installed    below the /opt/lampp    directory. Step 3: StartTo start XAMPP    simply call this command: /opt/lampp/lampp    start You should    now see something like this on your screen: Starting    XAMPP 1.6.5a...LAMPP:    Starting Apache...
 LAMPP:    Starting MySQL...
 LAMPP    started.
 Ready. Apache    and MySQL are running. If you get    any error messages please take a look at the Linux    FAQ. Step 4: TestOK, that was easy    but how can you check that everything really works? Just type in    the following URL at your favourite web browser:      http://localhost Now you    should see the start page of XAMPP containing some links to check    the status of the installed software and some small programming    examples. The Instant    Art example: A small PHP/GD program (since 0.9.6pre1 also a flashy    PHP/Ming example, see screenshot). Thanks to Anke    Arnold for her font »AnkeCalligraph«. A matter of security (A MUST    READ!)As mentioned    before, XAMPP is not meant for production use but only for    developers in a development environment. The way XAMPP is    configured is to be open as possible and allowing the developer    anything he/she wants. For development environments this is great    but in a production environment it could be fatal.      Here a list    of missing security in XAMPP:      The MySQL     administrator (root) has no password.      The MySQL daemon is accessible     via network.      ProFTPD uses the password     "lampp" for user "nobody".      PhpMyAdmin is accessible via     network.      Examples are accessible via     network.      MySQL and Apache running     under the same user (nobody).      
 To fix most    of the security weaknesses simply call the following command:      /opt/lampp/lampp    security It starts a small security check and    makes your XAMPP installation more secure.      Ads
 PHP 4 or PHP 5?Because such very    new versions like PHP 5 always should be handled with care we    decided to include both current versions of PHP into XAMPP since    version 1.4.7: PHP 5.x and PHP 4.x. If you find out your PHP    application doesn't work with PHP 5 you will be able to switch    back easily to PHP 4. By the    following command you can switch "back" to PHP 4.x:      /opt/lampp/lampp    php4 And with the following command you    can switch back to PHP 5.x:      /opt/lampp/lampp    php5 If you forgot which version of PHP    is in use simply use phpinfo() or call this command:      /opt/lampp/lampp    phpstatus Advanced start and stop parametersUntil version 0.9.4 /opt/lampp/lampp    could only start and stop XAMPP. Since version 0.9.5 it learned a    lot of new things to do. | 
 
 
              | START AND STOP PARAMETERS | 
     | Parameter | Description | 
 | 
 | 
     | start | Starts XAMPP. | 
 | 
 | 
     | stop | Stops XAMPP. | 
 | 
 | 
     | restart | Stops and starts XAMPP. | 
 | 
 | 
     | startapache | Starts only the Apache. | 
 | 
 | 
     | startssl | Starts the Apache SSL support. This command activates the SSL    support permanently, e.g. if you restarts XAMPP in the future SSL    will stay activated.      | 
 | 
 | 
     | startmysql | Starts only the MySQL database. | 
 | 
 | 
     | startftp | Starts the ProFTPD server. Via FTP you can upload files for    your web server (user "nobody", password "lampp").    This command activates the ProFTPD permanently, e.g. if you    restarts XAMPP in the future FTP will stay activated.      | 
 | 
 | 
     | stopapache | Stops the Apache. | 
 | 
 | 
     | stopssl | Stops the Apache SSL support. This command deactivates the SSL    support permanently, e.g. if you restarts XAMPP in the future SSL    will stay deactivated.      | 
 | 
 | 
     | stopmysql | Stops the MySQL database. | 
 | 
 | 
     | stopftp | Stops the ProFTPD server. This command deactivates the ProFTPD    permanently, e.g. if you restarts XAMPP in the future FTP will    stay deactivated.      | 
 | 
 | 
     | security | Starts a small security check programm.      | 
 | 
 | 
 
 
        | For example: To start Apache with    SSL support simply type in the following command (as root):      /opt/lampp/lampp    startssl You can also    access your Apache server via SSL under https://localhost. What is where?What is where? A big question of our    existens, here are some answers! ;) | 
 
 
              | IMPORTANT FILES AND DIRECTORIES | 
     | File/Directory | Purpose | 
 | 
 | 
     | /opt/lampp/bin/ | The XAMPP commands home. /opt/lampp/bin/mysql calls for example    the MySQL monitor. | 
 | 
 | 
     | /opt/lampp/htdocs/ | The Apache DocumentRoot directory. | 
 | 
 | 
     | /opt/lampp/etc/httpd.conf | The Apache configuration file. | 
 | 
 | 
     | /opt/lampp/etc/my.cnf | The MySQL configuration file. | 
 | 
 | 
     | /opt/lampp/etc/php.ini | The PHP configuration file. | 
 | 
 | 
     | /opt/lampp/etc/proftpd.conf | The ProFTPD configuration file. (since 0.9.5) | 
 | 
 | 
     | /opt/lampp/phpmyadmin/config.inc.php | The phpMyAdmin configuration file. | 
 | 
 | 
 
 
        | Stopping XAMPPTo stop XAMPP    simply call this command: /opt/lampp/lampp    stop You should    now see: Stopping    LAMPP 1.6.5a...LAMPP:    Stopping Apache...
 LAMPP:    Stopping MySQL...
 LAMPP    stopped.
 And XAMPP for    Linux is stopped.      UninstallTo uninstall XAMPP    just type in this command: rm    -rf /opt/lampp      The end.      |