Every Git user will have probably been asked to set up their Git at the first time: 1 2 git config --global user.name "Ramsay Leung" git config --global user.email ramsayleung@gmail.com The above command will simply add the user.name and user.email value into your ~/.gitconfig file 1 2 3 4 5 6 7 8 > cat ~/.gitconfig [user] name = Ramsay Leung email = ramsayleung@gmail.com [core] quotepath = false [init] defaultBranch = master You could also specify --local argument to writes the config values to .git/config in whatever project you’re currently in. ...

1 Goodbye 2023 As I farewelled to 2023, a year marked by numerous changes and personal evolution, I find myself recollecting the multitude of experiences that unfolded. My 2023 journey was nothing short of fascinating and exciting, prompting me to revisit the year from various angles. After seeing hoards of posts in social media generated by Github Contributions Chart, I thought I could also build an APP to summarize my Github contribution for every year for friends to have fun. ...

1 Introduction 1.1 IaC Infrastructure as code(IaC) is the managing and provisioning of infrastructure through code instead of manual processes, for example, clicking button, adding or editing roles in AWS console. 1.2 AWS CloudFormation AWS CloudFormation is the original IaC tool for AWS, released in 2011, which uses template files to automate and mange the setup of AWS resources. 1.3 AWS CDK AWS Cloud Development Kit(CDK) is a product provided by AWS that makes it easier for developers to manage their infrastructure with familiar programming languages like TypeScript, Python, Java, etc. ...

1 Definition In computer science, a topological sort or topological ordering of a directed graph is a linear ordering of its vertices such that for every directed edge uv from vertex u to vertx v, u comes before v in the ordering. It sounds pretty academic, but I am sure you are using topological sort unconsciously every single day. 2 Application Many real world situations can be modeled as a graph with directed edges where some events must occur before others. Then a topological sort gives an order in which to perform these events, for instance: ...

1 Preface I have been maintained a legacy distributed timer for months for my employer, then some important pay business are leveraging on it, with 1 billion tasks handled every day and 20k tasks added per second at most. Even though it’s old and full of black magic code, but it also also have insighted and well-designed code. Based on this old, running timer, I summarize and extract as this article, and it wont include any running code(perhaps pseudocode, and a lot of figures, as an adage says: A picture is worth a thousand words). ...