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Image of Advanced Programming in the UNIX Environment, Second Edition (Addison-Wesley Professional Computing Series)
Image of RHCE Red Hat Certified Engineer Linux Study Guide (Exam RH302) (Certification Press)
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Change GDM background in GNOME 3.2

Suppose you wish to change the background for GDM (GNOME Display Manager) to /usr/share/backgrounds/zim2687.jpg. Here is how to do it: # xhost +SI:localuser:gdm # sudo -u gdm gsettings set org.gnome.desktop.background picture-uri ‘file:////usr/share/backgrounds/zim2687.jpg’ # xhost -SI:localuser:gdm Log out and you should see the new background when GDM restarts.

Enable VirtualBox USB Support on Linux Appliance

To enable Oracle VirtualBox USB support for a user on Fedora or some other Linux distribution appliance, first install the VirtualBox Extensions Pack and then add the user to the vboxusers group. # usermod -a -G vboxusers your-username If the vboxusers group does not exist, create the group and add your username. # groupadd vboxusers # usermod -a -G vboxusers your-username Then reboot the Linux appliance and the user should be able to access USB devices.

Building VirtualBox Guest Additions on Debian 5

Here is what you need to do to successfully build and install the Oracle VirtualBox Guest Additions on Debian 5. First mount the VirualBox guest additions (Extensions Pack) media (Host-D). Then either mount your Debian 5 installation media or configure your Debian 5 package manager to download the necessary packages from a suitable repository. # apt-get update # apt-get install gcc make # apt-get install linux-headers-$(uname -r) # cd /media/cdrom # bash VBoxLinuxAdditions.run Then reboot your appliance and check that you can auto-resize the guest display. If not, check the build logs which are available under /var/log.

GNOME Tweak Tool – Shell Theme Caution Mark

I have seen many questions about enabling a GNOME Shell theme using gnome-tweak-tool that go like this: I have the user-theme extension installed and turned on in Gnome Tweak Tool. I’ve unzipped the theme folder to /usr/share/themes and selected my gtk theme fine. However under Shell Theme, there’s still a “!” and it doesn’t allow me to do anything as far as selection. (It’s greyed out) The caution sign is sometimes referred to as an exclamation mark by users. The best workaround for this is to enable your theme from the command lien using gsettings as follows gsettings set org.gnome.shell.extensions.user-theme

Fedora 16 GRUB2 Limitations

Got a MBR disk and GRUB2 core.img will not fit between the MBR and sector 63? This is common with on disks on which Windows XP was installed prior to trying to install Fedora 16. Typically you will receive a message similar to this: Your embedding area is unusually small. core.img won’t fit in it.. Embedding is not possible. GRUB can only be installed in this setup by using blocklists. However, blocklists are UNRELIABLE and their use is discouraged.. Here is what the Fedora deveopers have to say about this issue: Versions of Fedora prior to Fedora 16, and many