Open Multiple Application via Batch in Win10

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Before this COVID-19 thing happened, the desktop sitting on my desk runs for ever. I usally run some expensive jobs over night and came back to check the results in the next morning. Nowaways, the PCs are very different from the old days machines that require a regular restart from time to time. However, while working on a laptop since the lockdown started it's impossible to keep the laptop running all the time. So I have to start all the applications at the beginning of my working days and close them in the afternoon. If your work is to surf the internet and gather data, it's absolutely fine to click one button and job's done. But if your work relates to multiple applications, it is a bit annoying. I need to find a way of doing that automatically. There are some nice software that you can rely on (someone recommends AutoHotKey although I didn't try it). I'd like to do it lightweightly, say using batch file (in command line). Here we go!

Get Current Date and Time in Batch

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From time to time, we may need to get the current date and time in batch to automate some tasks. For instance, I am modifying the compiled programme names using the current date, which is easy to archive and search in the future. There are such DOS commands exist such as Date and Time, which you can use to retrieve or set the current date and time respectively. However, we may like to get all this information in one go and manipulate it as required. If you're on Windows like me, the Windows Management Instrumentation (WMI) Command line tool (WMIC.exe) could be used for this purpose. The following batch shows how to get the date and time information and use them as variables in the batch.

Add Share Folder in VirtualBox

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I have used VirtualBox for trying out linux client on my Win10 laptop. Sometimes, I do need share files between the host and client OS. The option looks straightforward. But it doesn't work like that. Here is the detailed steps.

C++ Tips: Get All System Environment Variables

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It's very common that you might need to get/edit/delete a system environment variable from time to time. In one of my previous post, I shared two functions that could get a system environment variable by its name or get all system environment variables in a map<string,string>. However, the function didn't return ALL variables if you checked here as shown in the screenshot.

In this post, I made another function that can obtain all system environment variables from the list.

C++ Tips: Grab Current Username and Datetime using C++

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From time to time, the current username and datetime need to be obtained in code for either saving system logs or debugging the code. If you are working in Windows like me, there are two functions available to do this. The first is GetUserName() in WinBase.h and the other is localtime() (and strftime() for formatting) in time.h (or  ). All you need to do is to include them in your header and call those functions when needed.

Here we go!

Run Jupyter Notebook with Double-click

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Jupyter notebook enables writing code with instructions in the same file, which is very convenient for preparing teaching materials. However, by using the default installation on Windows it requires typing commands in command window to start the server first.

To enable double-clicking opening on .ipynb files, the following command can be run using administrator privileges: