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Quick Tip #1
Disable Overlay Scrollbars in GNOME
For Ubuntu 12.10, open a terminal and type the following command:
gsettings set com.canonical.desktop.interface scrollbar-mode normal
Changes should occur instantly. The overlay scrollbars should now be replaced with normal scrollbars.

For Ubuntu 12.04, use the following command:
gsettings set org.gnome.desktop.interface ubuntu-overlay-scrollbars false
Log out and log back in for changes to occur.
Quick Tip #2
Mount an ISO Image from Command-Line
sudo mount -o loop /path/to/image.iso /path/to/empty/dir
Notice that /path/to/empty/dir must exist and should be empty.
Quick Tip #3
Find Out Current GNOME Version
For GNOME:
gnome-shell --version
For the Compiz window manager, use:
compiz --version
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10 Bash Tips for Working Faster With the Shell (Part 1 of 2)
Craciun Dan | December 20, 2010

Using !!
This command is used to bring back and automatically execute the last command in history. It is the same as pressing C^P followed by Enter). Here’s an example:

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