• Get the number of shutter count of a DSLR (Canon EOS 7D in my case):

    $ gphoto2 --get-config /main/status/shuttercounter
    Label: Shutter Counter
    Type: TEXT
    Current: 49238
    
  • Change the keyboard layout in Debian (don’t forget to logoff and logon to activate the new setting):

    $ dpkg-reconfigure keyboard-configuration
    
  • Low-level format of the hda device:

    $ dd if=/dev/zero of=/dev/hda
    
  • Same as above but for paranoïd, as random bits will be written 3 times before performing the “low-level format” (i.e. writting zeros):

    $ shred --verbose --force --iterations=3 --zero /dev/hda
    
  • Remove the MBR:

    $ dd if=/dev/null of=/dev/hda bs=446 count=1
    
  • Restore the original Windows MBR:

    $ apt-get install mbr
    $ install-mbr -i n -p D -t 0 /dev/hda
    
  • Guess the partition table of a device, including damaged ones:

    $ gpart -v /dev/md0
    
  • To add touchpad kernel support, add the following option to kernel at boot time:

    $ psmouse.proto=imps
    
  • Sometimes, depending of the laptop I use, the mouse pointer disappear from the screen when I plug a VGA cable to a projector. In this case, I do a CTRL + ALT + F1, then I login as a normal user and finally I start a new X session:

    $ startx -- :1
    

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