Privileges$ sudo command $ sudo -s $ sudo -s -u username $ sudo -k $ gksudo command $ kdesudo command $ sudo visudo $ gksudo nautilus $ kdesudo konqueror $ passwd Display$ sudo /etc/init.d/gdm restart $ sudo /etc/init.d/kdm restart $ sudo dexconf $ Ctrl+Alt+FN $ Ctrl+Alt+F7 $ Ctrl+Alt+Bksp System Services$ sudo start serviceName $ sudo start serviceName $ sudo status serviceName $ sudo /etc/init.d/service start $ sudo /etc/init.d/service stop $ sudo /etc/init.d/service status $ sudo /etc/init.d/service restart $ runlevel Package Management$ sudo apt-get update $ sudo apt-get upgrade $ sudo apt-get dist-upgrade $ sudo apt-get install pkgName $ sudo apt-get purge pkgName $ sudo apt-get autoremove $ sudo apt-get -f install $ sudo dpkg --configure -a $ sudo dpkg -i pkg.deb $ cat /etc/apt/sources.list Network$ ifconfig $ iwconfig $ sudo iwlist scan $ sudo /etc/init.d/networking restart $ cat /etc/network/interfaces $ sudo ifup interface $ sudo ifdown interface Special Packagesubuntu-desktop kubuntu-desktop xubuntu-desktop ubuntu-minimal ubuntu-standard ubuntu-restricted-extras kubuntu-restricted-extras xubuntu-restricted-extras build-essential linux-image-generic linux-headers-generic Firewall$ sudo ufw enable $ sudo ufw disable $ sudo ufw default allow $ sudo ufw default deny $ sudo ufw status $ sudo ufw allow portNumber $ sudo ufw deny portNumber $ sudo ufw deny from ipAddress Application Names$ nautilus $ dolphin $ gedit $ kate $ konqueror $ sensible-browser $ cal System$ lsb_release -a $ uname -r $ uname -a |