gkhays / til

Today I Learned

TIL

Today I Learned

My "Today I Learned" (TIL) snippets, inspired by jbranchaud/til. I'd also like to point out simonw/til.

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Categories

• Ansible
• Authentication
• AWS
• Bash
• Chrome
• Docker
• Dropwizard
• Electron
• Git
• GitHub
• H2
• HTML
• HTTP
• Java
• JavaScript
• Kubernetes
• Linux
• Markdown
• Maven
• Microsoft Teams
• PostgreSQL
• Postman
• PowerShell
• Raspberry Pi
• RDP
• React
• Rust
• SSH
• Terraform
• Terragrunt
• Ubuntu
• VIM
• VMware
• VSCode
• Wget
• Windows
• WSL

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Ansible

• Ansible configuration directory should not be world writable

Authentication

• JSON Web Token (JWT) debugger

AWS

• List MFA Devices
• List CIDR Blocks in Use
• List EC2 Instances Filtered by AMI
• List RDS Cluster Snapshots
• Exit Assumed IAM Role

Bash

• Get Multiple Values from a Bash Function
• Move Multiple Files
• Expand Parameters

Chrome

• Chrome Proxy
• How to Obtain a HAR Capture

Docker

• Compose, Build, and Tag
• Docker container statistics
• The difference between CMD and ENTRYPOINT
• Docker Compose Restart Policy
• Docker Health Check
• Format Docker Inspect with jq
• Override the Entry Point
• Volume Mounts on Windows
• Docker Import
• Extract File from Docker Image

Dropwizard

• Set the root path
• Shutdown options for Dropwizard
• Database transactions in non-Jersey resources
• Environment variables
• Add Swagger Documentation to Dropwizard
• Change Log Level Using Admin Task
• Run a Background Process in Dropwizard
• Update Deprecated API Reference

Electron

• Exclude Files from an Electron Project

Git

• Recover Deleted Branch
• Bypass Git Hooks
• Use Credential Manager Under WSL
• Merge Individual Files
• Checkout a Tag
• Remove a Tag
• Modify Commit Message
• Rename a Tag
• Change Commit for Tag
• Revert a Revert
• Find Commit by Git Hash
• Get the Commit Hash
• Locate Branches the Commit is On
• Signing Commits
• Remove Unused Branches
• Remove from Git but Keep Local File

GitHub

• Create Empty Folder with Online Editor
• GitHub CLI
• Add an Image to a Wiki
• Filter API Results with JQ
• GitHub Statistics in Your README

Golang

• Repeat a String in Go
• Reduce the Size of a Go Binary

H2

• Import Data to H2 From PostgreSQL

HTML

• Open a New Tab or Window from Form
• Disable Autocomplete
• Remove Indent from Lists
• HTML 5 Details Tag

HTTP

• A simple HTTP Request & Response Service

Java

• Execute a Java Class with JShell
• Use Jackson to deserialize an array of objects
• Ignore null values with Jackson
• Add Classpath to Shaded JAR
• Import External Library in JShell
• Hide Password in Command Line Argument using Argparse4j
• Convert Hex to Base64
• Get URI information
• Shebang! Run Single File Java as Script
• Display Contents of JAR Manifest
• Check Certificates in a Keystore
• Update Manifest inside JAR
• Java Console Application Spinner
• Java Simple Web Server

JavaScript

• Reload a Page
• Set JavaScript Console Log Level

Kubernetes

• Switch Context
• Copy Files from a Pod
• Obtain Previous Container's Crash Log
• List Recently Deleted Pods

Linux

• Type List Backwards
• Get Version and Details of Package Using Zypper
• TCP Command-Line Tool

Markdown

• List in Markdown Table Cell
• Internal, Relative Links
• Note and Warning Emphasis

Maven

• Maven Parallel Build
• Special Characters in Maven Settings
• Set Execute Permission in Maven

Microsoft Teams

• Navigate from the keyboard
• Export Wiki as PDF Document

PostgreSQL

• Export tables to CSV
• Change password
• Dump a Database from a Docker Container
• PostgreSQL Is Ready Utility
• Analyze a PostgreSQL Database from the Command Line

Postman

• Load payload from file
• Show Request Headers

PowerShell

• Get Windows Capability
• Scoop
• Equivalent of Which in PowerShell
• How to Dot Source in PowerShell
• Generate a GUID

Raspberry Pi

• Play Sound from Unattended Session

RDP

• Multiple Monitors with Remote Desktop Session

React

• How to Use Comments in React

Rust

• Isolating a Rust Application in a Docker Container

SSH

• sshpass
• ssh-copy-id
• Show SSH Key Hashes
• Remove Passphrase from SSH Key

Terraform

• Create a graph of Terraform resources

Terragrunt

• Fix empty tuple error

Ubuntu

• Recover root password on Ubuntu 18.04
• Disable ipv6 in Ubuntu
• Troubleshoot reverse lookups on Ubuntu 18.04
• Set Default Java Version

Vim

• Alternative to Escape Key

VMware

• Force BIOS Setup

VSCode

• Change VSCode Terminal Font
• Attach a Source JAR
• Search and Replace Tabs in VSCode

Wget

• Output JSON Response to Stdout

Windows

• Retrieve Windows product key
• Look up RGB codes with Microsoft Paint
• Command Line Interface to Windows Credential Manager
• Decode Base64 on the Command Line
• Set up Powerline in Windows Terminal
• Add Cmder to Windows Terminal
• Applications Virtual Folder Shortcut
• Using Windows 10 Snip & Sketch
• Add Git Bash to Windows Terminal

WSL

• Map WSL Disk as Network Drive
• Browse WSL Files from Windows Explorer
• Set Terminal Starting Directory to WSL Home
• Limit WSL 2 Memory

Acknowledgements

I "borrowed" this idea from jbranchaud/til.

License

© 2020 Garve Hays

This repository is licensed under the MIT license. See LICENSE for details.

til's Issues

Remove indent HTML article isn’t working

JavaScript category has extra character