Your questions are pretty easy to answer.
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Originally Posted by mayank_a
1. How to associate a file.extension with a application and pass the file name to the application, whenever the icon of that file.extension is clicked??
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The easiest way to do this is to open the KDE file manager. Select one of the files of the type that you want to configure. Right click your mouse. A menu will appear. Select "Open with...". Another menu will appear. You will see a list of the applications that are already configured to open this type of file. At the bottom of this list is the option for using another application. Select that. A new window will appear that will allow you to edit all of the existing applications associated with that file type and to add another application for that file type. You will also be able to select the preference order so that you can put your new application in the list, move it to the top of the list, and leave the other applications in the list. KDE will use the application at the top of the list when you click on a file of this type from the file manager.
The hard way to do this would be to start the kcontrol applications, go to the file association applet, and try to edit these records. I don't recommend this approach.
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Originally Posted by mayank_a
2.How to give a Group of users certain acess rights to a group of directories owned by other groups??
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You can use secondary user groups for this. You can create a user group just for accessing this shared directory. Let's call this new user group sharedir.
groupadd sharedir
Then you make this group the owner of the shared directory. If the shared directory was named /home/shared_dir you would enter the following commands.
chgrp sharedir /home/shared_dir
chmod g+rwx /home/shared_dir
Now you add the group sharedir to the list of secondary user groups of the users that should be able to access this directory. Note that you will have to see what these user accounts already have for their secondary accounts because the usermod command requires you to copy them when you add sharedir to the list. For example, if you have a user account named tom. This user account has the primary user group as users. The tom account also has video and audio as secondary user groups. You will have to write the complete list of secondary user groups when you use the usermod command on the tom accounts. Example:
groups tom
tom : users video audio
usermod -G "video, audio, sharedir" tom
groups tom
tom : users video audio sharedir
The tom account will have to log out and log in before he can use the sharedir group added to the account.
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Originally Posted by mayank_a
3. How to make Panel Buttons/Icons same for any login user I create?
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Naturally the user accounts will all start the same. The window managers all have a default configuration. If you want to customise an environment and have that automatically created for each new user then you could do this:
create a template user account
configure it the way that you want
copy all of the files and directories back to /etc/skel
Or, you could read about how to configure the default environment for the window manager that you are using (KDE) at the web site for documentation of that software.
