Ubuntu or Linux command terminal guidance

With the increasing development of Linux, today Linux program with a display that supports GUI (Graphical User Interface) more and more. With the GUI (Graphical User Interface) so that users increasingly easier to operate. The consequences of the use of GUI in Linux is mainly of a system computer with minimum specifications.
For starters, here are some common commands used in Linux Ubuntu, among others:

Privileges
sudo command – run command as root
sudo -s – open a root shell
sudo -s -u user – open a shell as user
sudo -k – forget sudo passwords
gksudo command – visual sudo dialog (GNOME)
kdesudo command – visual sudo dialog (KDE)
sudo visudo – edit /etc/sudoers
gksudo nautilus – root file manager (GNOME)
kdesudo konqueror – root file manager (KDE)
passwd – change your password

Display
sudo /etc/init.d/gdm restart – restart X and return to login (GNOME)
sudo /etc/init.d/kdm restart – restart X and return to login (KDE)
(file) /etc/X11/xorg.conf – display configuration
sudo dexconf – reset xorg.conf configuration
Ctrl+Alt+Bksp – restart X display if frozen
Ctrl+Alt+FN – switch to tty N
Ctrl+Alt+F7 – switch back to X display

Package Management
apt-get update – refresh available updates
apt-get upgrade – upgrade all packages
apt-get dist-upgrade – upgrade with package replacements; upgrade Ubuntu version
apt-get install pkg – install pkg
apt-get purge pkg – uninstall pkg
apt-get autoremove – remove obsolete packages
apt-get -f install – try to fix broken packages
dpkg --configure -a – try to fix broken packages
dpkg -i pkg.deb – install file pkg.deb
(file) /etc/apt/sources.list – APT repository list

Special Packages
ubuntu-desktop – standard Ubuntu environment
kubuntu-desktop – KDE desktop
xubuntu-desktop – XFCE desktop
ubuntu-minimal – core Ubuntu utilities
ubuntu-standard – standard Ubuntu utilities
ubuntu-restricted-extras – non-free, but useful
kubuntu-restricted-extras – KDE of the above
xubuntu-restricted-extras – XFCE of the above
build-essential – packages used to compile programs
linux-image-generic – latest generic kernel image
linux-headers-generic – latest build headers

Network
ifconfig – show network information
iwconfig – show wireless information
sudo iwlist scan – scan for wireless networks
sudo /etc/init.d/networking restart – reset network for manual configurations
(file) /etc/network/interfaces – manual configuration
ifup interface – bring interface online
ifdown interface – disable interface

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