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Copy Shell Prompt Output To Linux / UNIX X Clipboard Directly

Q. How do I copy output of command to Linux Gnome clipboard? How do I send files directly to X Windows clipboard from a shell prompt? How do I insert command line output or files contains into the clipboard?
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Ubuntu Linux: Firefox and Desktop Application Fix Smooth Font Problem ( Render Font Correctly )

Q. How do I render font smoothly in Ubuntu Linux / Gnome desktop systems? How do I get look a likes of the Microsoft / Mac OS X smooth fonts for Firefox and other applications?
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How To Select Best Linux Desktop Application

Q. I'm new to GNU/Linux world and a single query (apt-cache search office or yum search 'office') shows so many application for a single task such as network monitoring or office applications. The number of apps choices just confusing. How do you select application from so many choices?
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Linux Create a Custom Gnome Login Desktop Screen

Q. I'd like to keep same login screen for my school Linux desktop system lab. How do I create a custom gnome login screen or menu under CentOS or Ubuntu Linux desktop systems?
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How To Take A Screenshot Using Linux tvtime Application

Q. I use my system as Linux digital tv and tvtime application to watch TV. How do I take a screenshots under tvtime?
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Linux Gnome: Networkmanger Connects To Wrong Default Wireless Access Point

Q. I'm using Ubuntu Linux and my Gnome network manger always connects to wrong default WAP / AP after login ( boot ). How do I fix this problem?
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HowTo: Find the GNOME Desktop Version

How do I find out GNOME desktop version from a shell prompt or GUI?
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Remove Shutdown and Reboot Option from Linux GUI Login Screen ( GDM Setup )

Q. I've a central Linux test server. It has GDM based GUI login screen. How do I remove both shutdown and reboot server options from the login screen?
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How to Tunnel X Windows Securely over SSH

Q. How do I tunnel X Windows Securely over SSH? I'd like to run X program on my remote Linux server and get back display to Laptop computer connected by high speed internet?

A. A tunneling protocol is a network protocol which encapsulates a payload protocol, acting as a payload protocol. Reasons to tunnel include carrying a payload over an incompatible delivery network, or to provide a secure path through an untrusted network.

SSH is frequently used to tunnel insecure traffic over the Internet in a secure way. Simply type the following command:

$ ssh -X user@server.corp.com
$ ssh -X user@

You can requests compression of all data to improve up user experience (good for a low speed link such as wan link) using -c option:
$ ssh -c -X user@

Once logged in type any X windows program name such as:
$ xeys &
$ oowriter &

To start kde type:
$ startkde &

To start default desktop type:
$ startx

Fedora / CentOS / RHEL Linux change default desktop or display manager

Q. How do I change default desktop / display manager under CentOS or Fedora Linux? I'd like to change default GNOME to KDE as desktop manager for all users.

A. There is a configuration file called /etc/sysconfig/desktop. This file defines default display manager and desktop name.

Display manager can be any one of the following:
[a] gnome (gdm)
[b] kde (kdm)
[c] xdm (xdm)

Desktop can be any one of the following
[a] KDE
[c] XFCE

Change Desktop from Gnome to Kde

Open /etc/sysconfig/desktop file:
# vi /etc/sysconfig/desktop
Set DESKTOP variable to kde:

Save and close the file.

Now kde will be used for all users as desktop system. You can also accomplish this on a per-user basis by using the desktop switcher application from the extra preferences menu, or just type the command:
$ switchdesk kde

See also:

=> Quick way to switch from KDE to GNOME or viceversa