Run lz4 compression in parallel using GNU parallel

I like compressing my SQLite DB as separate lz4 files. I use the below commands to compress them in parallel using the lz4 utility.

parallel lz4 -12 -m ::: *.db

You can install GNU parallel on Ubuntu using the below command

sudo apt install parallel

Note: Passing -m option to the lz4 utility is essential to avoid stdout outputs.

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Fix gtest linker error on Windows

If you are getting the below-mentioned linker error with Google gtest on Windows MSVC, the solution is to define the macro within your project file/Makefile.
Linker error:

error LNK2001: unresolved external symbol "class testing::internal::Mutex testing::internal::g_gmock_mutex" (?g_gmock_mutex@internal@testing@@3VMutex@12@A)

Macro to declare within your project file/Makefile:
GTEST_LINKED_AS_SHARED_LIBRARY=1

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Tags: gtest, linker error

Fix slow VNC connection to headless Linux server with intel GPU

Back in 2018, I had observed that VNC connections to headless Ubuntu 16.04 server (the one without any monitors connected) was extremely slow and laggy. After bunch of experiments, I figured out that the problem was caused due to missing Xorg.conf template

Below solution was tested with Ubuntu 16.04, I am not sure if same problem is still observed with newer Ubuntu versions

Solution:

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Ubuntu Force apt to use IPv4

On U16.04, I found that apt took really long time to update over IPv6.

Enter below command to force the use of IP v4 for apt

echo "Acquire::ForceIPv4 "true";" | sudo tee /etc/apt/apt.conf.d/99force-ipv4 > /dev/null

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How to install Dropbox on Linux with single sign on (SSO)

I had to do mini research to be able to successfully install dropbox on Linux with single sign-on. Here are the steps I followed.

1. Close all browsers windows.
2. Open fresh browser window, visit to https://www.dropbox.com/ and login using SSO.
3. Once logged-in, install dropbox package as usual. I used below steps
   • Download the .deb package from https://www.dropbox.com/install-linux
   • Enter command sudo dpkg -i <.deb package file path>
4. Open Dropbox from the installed program files, click OK to install dropbox daemon process.
5. It should open your browser once again and ask for linking confirmation. Press OK.

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Keywords:

• dropbox linux enter linking code
• Entering Linking Code After Dropbox Install on Ubuntu/Linux

Script to disable automatic updates on Ubuntu 16.04

I work on Ubuntu with some custom Kernel extensions which needs to be built upon each Kernel updates. Since, it is a dev. environment, sensible option was to lock the packages which I was using for development.

Below script disables automatic package updates on Ubuntu 16.04.x

Note: Do NOT disable security updates on production system!

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qDebug log with and without spaces in a single sentence

Below sample shows how spaces can be disabled/enabled in middle of a single qDebug log.

Keyword: qDebug disable space in middle of log