Useful Unicodes

I often need to input Unicode symbols into documents.

  • In Linux, Ctrl + Shift + U following by the Unicode number.
  • In Microsoft Word, Unicode number then Alt + X.

Here are a few of my favorite Unicodes:

Name Symbol Number
Copyright sign © 00A9
Registered sign ® 00AE
Em Dash 2014
Dagger 2020
Bullet 2022
Therefore 2234
Because 2235
Black square 25A0
White square 25A1
White square with rounded corners 25A2
White square with black small square 25A3
Warning sign 26A0
Check mark 2713
Heavy check mark 2714
Ballot X 2717
Heavy ballot X 2718

Using Multiple Desktops in Raspbian Jessie

To set up multiple desktops:

  1. Click Menu
  2. Click Preferences
  3. Click Openbox Configuration Manager
    menu to Openbox Configuration Manager
    Menu to obconf

    If you do not see the Openbox Configuration Manager, install it by running:
    sudo apt-get install -y obconf

  4. Click on the Desktops tab, and select the desired Number of desktops.
    Desktop Settings
    Desktop Settings

You now have multiple desktops, use the keyboard shortcuts Ctrl + Alt + ⇨ or Ctrl + Alt + ⇦ to switch between the next and previous desktop.

If the shortcuts keys do not work, refer to the following post for Raspbian keyboard shortcuts to change your key-binding in Openbox.

Location of Raspbian Jessie keyboard shortcuts

The default keyboard shortcut setting is in the file
under the <keyboard> section.

There may also be an rc.xml setting file in the same folder for your reference

Your personal shortcuts, if they exists, is in

For examle, add the following in the <keyboard> section to move to adjacent desktop workspace

<keybind key="C-A-Left">
  <action name="DesktopLeft"/>
<keybind key="C-A-Right">
  <action name="DesktopRight"/>

Installing Node.js on Linux from Binaries

  1. Download Node.js binaries

    Node.js binaries are available at You can download the more stable LTS version or Current version with the latest features.

  2. Extract the download binary files

    You can either first extract the binary files to a temporary directory, then copy them to the /usr/local directory; or extract the files right into the /usr/local directory.

    1. Extract to temporary folder, and then copy the files to /usr/local folder.

      # cd temp
      # tar -xvJf ~/downloads/node-v7.2.0-linux-x64.tar.xz
      # cd node-v7.2.0-linux-x64
      # sudo cp -R . /usr/local
    2. Extract directly into the /usr/local folder. First change directory to /usr/local, and then issue the tar command.

      # sudo tar --strip-components=1 -xvJf ~/downloads/node-v7.2.0-linux-x64.tar.xz
  3. Check Node.js installation
    # node -v
  4. Check npm installation
    # npm version
    { npm: '3.10.9',
      ares: '1.10.1-DEV',
      cldr: '30.0.2',
      http_parser: '2.7.0',
      icu: '58.1',
      modules: '51',
      node: '7.2.0',
      openssl: '1.0.2j',
      tz: '2016g',
      unicode: '9.0',
      uv: '1.10.1',
      v8: '5.4.500.43'
      zlib: '1.2.8' }