Linux has a complex command line interface. So complex that sometimes to accomplish rather simple tasks you have to read countless pages of documentation. This site wants to make life easy for the linux users providing a series of most common used commands and options.

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Some times Gnome stops responding. Instead of rebooting the computer using the reboot button when this happens here is a list of things you can try first:

• attempt to switch to a text terminal using Ctrl+Alt+F1 key combination then run top to see what process is taking up CPU and eventually kill it. The Ctrl+Alt+F1to Ctrl+Alt+F6 key combinations will switch to a text terminal, in order to return to the Gnome graphical terminal use Ctrl+Alt+F7
• restart Gnome by pressing Ctrl+Alt+Backspace, this will kill the current instance of X-windows server and you will be taken back to the graphical login prompt
• reboot the system using the magic SysRq key in order to flush unsaved data and safely unmount devices. To do this use the following key combinations in this order, waiting a few secons after each combination:
  • Alt+SysRq+e - this will send an TERM message to all processes telling them to exit
  • Alt+SysRq+s - this will sync all mounted systems
  • Alt+SysRq+u - this will attempt to unmount all file systems and mount them as readonly
  • Alt+SysRq+i - this will send a KILL signal to all processes except init
  • Alt+SysRq+b - this will reboot the system