Linux常用Hotkey 
  General 
  Ctrl+A = Select all (In Documents, Firefox, Nautilus, etc, not Terminal)    
Ctrl+C = Copy (In Documents, Firefox, Nautilus, etc, not Terminal)     
Ctrl+V = Paste (In Documents, Firefox, Nautilus, etc, not Terminal)     
Ctrl+S = Save (Save the current document, not in terminal)    
Ctrl + Alt + F1 = Switch to the first virtual terminal    
Ctrl + Alt + F2(F3)(F4)(F5)(F6) = Select the different virtual terminals     
Ctrl + Alt + F7 = Switch to current terminal session with X    
Ctrl+Alt++ = Switch to next X resolution (Depends of your X configuration)    
Ctrl+Alt+- = Switch to previous X resolution (Depends of your X configuration)    
Ctrl + Alt + Backspace = Kill X server    
Alt+Tab = Switch between open programs    
Printscrn = Print sreen 
  Command line / Terminal shortcuts 
  Ctrl+C = Kill process (Kill the current process in terminal, also used to copy elsewhere)   
Ctrl+Z = Send process to background    
Ctrl+D = Log out from the current terminal. In X, this may log you out after a shuting down the emulator.    
Tab = List available commands from typed letters (Ex: type iw and click tab, output = iwconfig iwevent iwgetid iwlist iwpriv iwspy)    
Arrows up and down = Browse command history    
Ctrl+R = History search (Finds the last command matching the letters you type)    
Shift+PageUp / PageDown = Scroll terminal output    
Shift+insert = Paste