On Oct 2, Linus Torvalds proudly announced the release of Linux 4.8. But just days after the release, a bug was found in the kernel and Linus came out and apologized for this bug.I'm really sorry I applied that last series from Andrew just before doing the 4.8 release, because they cause problems, and now it is in 4.8 (and that buggy crap is marked for stable too).In particular, I just got this kernel BUG at ./include/linux/swap.h:276 and the end result was a dead kernel.The bug that commit 22f2ac51b6d64 ("mm: workingset: fix crash in shadow node shrinker cau...

SSH is a popular cryptographic network protocol for secure network service operation. It is frequently used in remote server login. For a system administrator or software developer, SSH is frequently used to access remote servers or development servers or testing servers etc. To login with SSH, there are different authentication mechanisms : password, public key and interactive etc. If a remote server needs to be accessed frequently, password authentication may be too troublesome as password needs to be typed every time. In this scenario, public key authentication would be a life sav...

JSON now becomes a very popular data format because of its simplicity and light-weight. Nowadays many RESTful APIs will offer a choice of exchanging JSON data between the server and client. Sometimes the data may not be formatted and it cannot be easily read by human beings. It's frequently desired that the unformatted JSON data should be formatted before read.Today we will show a few ways to format JSON data on Ubuntu. Assume we have a json file test.json with below content.{ "title": "Test", "description": "Sample description" }The normal cat command will output below content.postman@postman...

This is a Q&A post after sharing Guide for installing Ubuntu in VirtualBox on Windows1. If the resolution of the installed guest OS on the VirtualBox is too small(For example 640x480) and you cannot adjust it through System Settings -> Display, what should you do?A: In this case, it is mostly probably you don't have the VirtualBox Guest Additions installed. You can install the Guest Additions on your guest OS by:sudo apt-get install virtualbox-guest-dkmsThen restart the VM and you will see the resolution you want.2. How to share a folder from guest OS to host OS. The guest OS is Ubuntu ...

For a long time, there is a doubt among lots of Windows users especially those English speaking users, that is why Microsoft chooses Alt+F4 to close a window instead of Alt+Q. Alt+Q is more comfortable to press for many keyboards, also Q represents Quit and it is easier for people to understand. Recently Microsoft answered this doubt.Raymond Chen, longtime Microsoft developer and semi-official Windows historian, said the reason is that not everyone speaks English. It doesn't work that way in many other languages. You have to choose a common key sequence which people fr...

I have knowledge on 32-bit vs 64-bit, but not very clear minded.Here is a good article I found about it.http://www.techsupportalert.com/content/32-bit-and-64-bit-explained.htm Understand there are 3 things involved: CPU, OS and application.To work on 64-bit, first thing first is: you need a 64-bit CPU. 64-bit CPU usually provide emulation for 32-bit system. Though some 32-bit application still cannot run on 64-bit OS, because they might contain 16-bit code.32-bit system won't have compatibility for 64-bit application. Also 32-bit CPU won't run 64-bit OS or application. In windows, yo...

Previously we showed how to install Ubuntu in VirtualBox. What if we want to communicate with the host OS from within the Guest OS on VirtualBox? There are a few ways to do this. For example, bridged network, Host only networks. Today we will show you how to enable network communication between host OS and guest OS using host only networks.A host only network will not need to access the physical network interface of the host OS. It will create a network between different virtual machines and the host machine. This is very useful if you want to set up a network of machines which just need to co...

When opening a text file, you may be used to right click on the file to be opened and then choose the application which can open the file from the context menu. On the context menu, you may see a menu item like "Edit with Notepad++".Nowadays many people especially programmers like to use Sublime Text, but by default this application will not show on the context menu when you right click on a file. There is now frequent request to add this application to the context menu. Here we show a simple batch file which can help you achieve this.Below is the batch code :@echo offSET sublimeTextPath=C:\Pr...