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Operating System Tools

Notes Document Handlers

The Document Handlers section of the Gnome Control Center allows you to change the way
certain fi le types and functions are viewed, edited or manipulated. This section confi gures the
default programs used to run specifi c files based on their content type or URL.

Default Editor : Default editor sets the text editor to be utilised by default when we open an

editable file or select the Edit menu command on a file within the file manager. A drop-down list
of available editors is displayed. Click the Run in Terminal Window button if your chosen editor
must be run in a terminal.
Mime Types : Mime types allows us to set or edit mime types. Click the Add button to add a
new type. A dialog will open asking for the category/type listing for the mime type and the
extensions to associate with it. Optionally, you can supply up to two regular expressions to
identify the mime type. To edit a mime type, select it in the listing and click the Edit button. You
will see a dialog box in which you can choose an icon to be used for the file type, add or remove

file extensions, and supply commands that will open, view, and edit this type of file. To delete a

type, select it from the list and click the Delete button.
URL Handlers : It allows us to adjust the settings for special URL launchers utilized by the GNOME
help system. The defaults for protocols like HTTP, FTP, and Mail are already set and likely
handled by your default web browser (for instance, Netscape). The special URLs are ghelp, info,
and man, corresponding to GNOME help fi les, command info fi les, and man files. The defaults use

the help browser for these types of files. It is best to leave these settings as they are.

Task Analyze the functions provided by GNOME Control Center.

Self Assessment

Fill in the blanks:

9. ................................ is the system for storing and retrieving configuration settings in
GNOME.

10. The GNOME Control Center allows you to configure various parts of your GNOME system
with different tools called “................................”.
11. The ................................ section controls the most visible global settings for your Gnome
environment.

2.6 Managing Processes

A process is defined as an independent program entity which executes and makes use of
computer resources like CPU time and memory. Every application that is executed is started
as an independent process. An application may begin its own child processes. Certainly many
applications such as web servers and database servers consist of numerous processes to fulfi l the
requirements of different clients simultaneously.

2.6.1 Understanding Processes

Generally, a process is initiated by a parent process. The process that is launched recently can
successively launch child processes if required. When working at the desktop, all new programs
are executed as child processes of the program that is obtaining as well as interpreting the
commands.

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