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CentOS / RHEL Linux: Remove GDM

How do I uninstall a GUI Gnome login system ( GDM ) from my CentOS Linux v5.5 based server?
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Linux Disable and Remove X Windows (X.org)

I revived my new Dell server pre installed with Red Hat Enterprise Linux server v5.2. However, my box boot with a GUI login system ( Gnome ). There is no reason to run X Windows on my dedicated mail and Apache web server. I only need ssh. How do I disable X login and windows without reinstalling the operating system to improve security and performance?
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I've ATI Radeon VGA [X1550 64 bit] card. How do I find find out if the driver is installed or not under any Linux distribution running xorg server?
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Linux Disable X Window System

Q. How do I disable X Window system on boot? I just need text based interface and there is no need to waste resources on X window system. How do I disable X Window under CentOS / RHEL / Red Hat / Fedora Linux?
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Redhat Enterprise Linux (RHEL) install ImageMagick RPM for manipulating images

Q. How do I install ImageMagick software under Redhat enterprise Linux version 4 update 5?

A. ImageMagick is an image display and manipulation tool for the X Window System. ImageMagick can read and write JPEG, TIFF, PNM, GIF, and Photo CD image formats. It can resize, rotate, sharpen, color reduce, or add special effects to an image, and when finished you can either save the completed work in the original format or a different
one. ImageMagick also includes command line programs for creating animated or transparent .gifs, creating composite images, creating thumbnail images, and more.

ImageMagick is one of your choices if you need a program to manipulate and display images. If you want to develop your own applications which use ImageMagick code or APIs, you need to install ImageMagick-devel as well.

INSTALL ImageMagick

Use up2date command to install ImageMagick, enter ( <= RHEL 4 only): # up2date install ImageMagick
OR use yum if you are using Fedora Core/CentOS/RHEL 5:
# yum install ImageMagick

Essential ImageMagick Hacks/Tips/Faqs...

Now use ImageMagick from command line or GUI: