Ubuntu Cheat Sheet

 

Ubuntu Reference

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

 

System Services¹

 

start service start job service (Upstart)
stop service stop job service (Upstart)
status service check if service is running (Upstart)
/etc/init.d/service start start service (SysV)
/etc/init.d/service stop stop service (SysV)
/etc/init.d/service status check service (SysV)
/etc/init.d/service restart restart service (SysV)

 

Package Management¹

 

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

 

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

 

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

 

Firewall¹

 

ufw enable turn on the firewall
ufw disable turn off the firewall
ufw default allow allow all connections by default
ufw default deny drop all connections by default
ufw status current status and rules
ufw allow port allow traffic on port
ufw deny port block port
ufw deny from ip block ip adress

 

Application Names

 

nautilus file manager (GNOME)
dolphin file manager (KDE)
konqueror web browser (KDE)
kate text editor (KDE)
gedit text editor (GNOME)

 

System

 

Recovery Type the phrase “REISUB” while holding down Alt and SysRq (PrintScrn)
with about 1 second between each letter. Your system will reboot.
lsb_release -a get Ubuntu version
uname -r get kernel version
uname -a get all kernel information

 

1. Prefix commands with sudo to run.
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