Zero Fill Hard Disk in Linux

#shred -n 2 -z -v /dev/sdc1

-n 2 = number of passes
-z = overwrites hard disk data with zeroes
-v = display progress operation
/dev/sdc1 = partition

Ubuntu Dual Screen with 1 Touchscreen

$ xinput --list

⎡ Virtual core pointer                     id=2 [master pointer  (3)]

⎜   ↳ Virtual core XTEST pointer               id=4 [slave  pointer  (2)]

⎜   ↳ Advanced Silicon S.A. CoolTouch(TM) System id=11 [slave  pointer  (2)]

⎜   ↳ Dell Dell Universal Receiver             id=14 [slave  pointer  (2)]

⎜   ↳ ETPS/2 Elantech Touchpad                 id=17 [slave  pointer  (2)]

⎣ Virtual core keyboard                   id=3 [master keyboard (2)]

    ↳ Virtual core XTEST keyboard             id=5 [slave  keyboard (3)]

    ↳ Power Button                             id=6 [slave  keyboard (3)]

    ↳ Asus Wireless Radio Control             id=7 [slave  keyboard (3)]

    ↳ Video Bus                               id=8 [slave  keyboard (3)]

    ↳ Video Bus                               id=9 [slave  keyboard (3)]

    ↳ Sleep Button                             id=10 [slave  keyboard (3)]

    ↳ USB2.0 UVC HD Webcam                     id=12 [slave  keyboard (3)]

    ↳ Dell Dell Universal Receiver             id=13 [slave  keyboard (3)]

    ↳ Asus WMI hotkeys                         id=15 [slave  keyboard (3)]

    ↳ AT Translated Set 2 keyboard             id=16 [slave  keyboard (3)]

$ xrandr

Screen 0: minimum 8 x 8, current 3286 x 1080, maximum 32767 x 32767

eDP1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 309mm x 174mm

   1366x768      60.00*+

   1360x768      59.80    59.96  

   1280x720      60.00  

   1024x768      60.00  

   1024x576      60.00  

   960x540       60.00  

   800x600       60.32    56.25  

   864x486       60.00  

   640x480       59.94  

   720x405       60.00  

   680x384       60.00  

   640x360       60.00  

HDMI1 connected 1920x1080+1366+0 (normal left inverted right x axis y axis) 477mm x 268mm

   1920x1080     60.00*+  50.00    59.94  

   1920x1080i    60.00    50.00    59.94  

   1280x1024     75.02    60.02  

   1152x864      75.00  

   1280x720      60.00    50.00    59.94  

   1024x768      75.03    60.00  

   800x600       75.00    60.32  

   720x576       50.00  

   720x576i      50.00  

   720x480       60.00    59.94  

   720x480i      60.00    59.94  

   640x480       75.00    60.00    59.94  

   720x400       70.08  

VIRTUAL1 disconnected (normal left inverted right x axis y axis)

$ xinput map-to-output 11 HDMI1

Extract windows serial from BIOS

sudo xxd /sys/firmware/acpi/tables/MSDM

RUBY ON RAILS INSTALLATION (WINDOWS 7 x64)

Step 1

Download all the required files below:-

1. https://dl.bintray.com/oneclick/rubyinstaller/rubyinstaller-2.3.3-x64.exe
2. https://dl.bintray.com/oneclick/rubyinstaller/DevKit-mingw64-64-4.7.2-20130224-1432-sfx.exe
3. https://nodejs.org/dist/v6.10.0/node-v6.10.0-x86.msi

Step 2

1. Install rubyinstaller installer
2. install devkit
• create directory c:\devkit
• extract devkit package into the directory
• cd to the directory and type “ruby dk.rb init”
• then type “ruby dk.rb install”
3. Install nodejs installer

Step 3

1. Open ruby command prompt (program files)
2. Type “gem install rails”
3. Type “gem install bundler”