til - Today I Learned

A Collection of daily lessons I've learned about tech, software development, business, and cyber security. References provided when possible.

I started this repo to:

• Create a central location for this type of information
• Reinforce what I learn by restating the idea in my own words
• Share with others

Categories

• Concepts
• Cryptography
• Dell
• Docker
• Excel
• Finance
• Git
• HTML
• Intune
• Javascript
• Linux
• Mac
• Microsoft
• Networking
• Outlook
• Phishing
• PowerShell
• Python
• SSH
• VBA
• vscode
• virtualbox
• Windows

---

Concepts

• A Mental Model For Technical Debt
• Complicated Versus Complex Systems
• DRY Programming Isn't Always Best
• Five Stages Of The Dreyfus Model
• Keep A Changelog
• Single Responsibility Principle
• Time Epochs In Computers
• Understand Reflection Versus Introspection
• Understand Serialize Versus Deserialize

Cryptography

• AES-CBC Plaintext Padding

Dell

• Boot Option Key Combinations
• Perform Hard Reset
• Run Dell Hardware Diagnostics
• Shut Down To Service Mode

Docker

• Fix Docker Volume Invalid Mode Error
• Folders To Clear During Docker Desktop Uninstall

Excel

• Find The Location Of The Personal.xlsb File
• Split Text And Remove Whitespace

Finance

• Convert Basis Points To Percent
• What On Balance Sheet Means For A Bank
• Wire Routing Number Is Called Many Things

Git

• Add Global Git Alias
• Delete Merged Branches
• Get Submodule Data After Cloning the Containing Project
• A Git Workflow For Cleaner Commits
• Remove a Tracked File From Git
• Rename a Git Tracked File
• Rename an Existing Branch
• Resources For Learning Git

HTML

• Add Non-Breaking Spaces To HTML or Markdown
• Understand Block Versus Inline Elements

Intune

• Folder path for Collect Diagnostics in Intune
• Intune Device Name Length Limit

Javascript

• Javascript Deobfuscation Resources

Linux

• Change Hostname on Raspbian
• Exclude Term From Grep Results
• Get Alternate Data Streams in Linux
• Get File Hash Using OpenSSL
• Set UFW Allow From Subnet Rule
• Show File and Folder Sizes In The Terminal
• Understand Man Page Sections

Mac

• Create a File With All Installed Brew Packages
• Exclude Term From Grep Results
• Find and Change the Shell in macOS
• Find Imported Music Files In macOS
• Get Alternate Data Streams in macOS
• Get OS Version From the Terminal
• Get File Hash Using OpenSSL (from Linux)
• Insert an Em Dash in macOS
• PowerShell Profile Locations
• Rename File In A Long Path
• Replace Symlink Without Deleting The Original
• Screenshot Keyboard Shortcuts
• Understand Man Page Sections
• View USB Storage In Terminal

Microsoft

• How To Access UEFI Settings On A Surface Laptop
• How to Boot From A USB Drive On A Surface Device
• How to Create A Surface Device Recovery Tool
• How To Enroll A New PC in Autopilot
• Reset Device Previously Joined to Entra ID

Networking

• OSI Model Layers and Mnemonic
• TCP Three-Way Handshake

Outlook

• Outlook Calendar Change Time Scale
• Outlook Permanently Delete Messages

Phishing

• Understanding ZeroFont Phishing

PowerShell

• Break Long Results Into Pages
• Copy and Rename Files in a Folder
• Count Files In A Directory
• Create A Globally Unique Identifier
• Create A System Restore Point
• Decode String From Base64
• Deep Copy Nested Objects in PowerShell
• Delete Merged Git Branches
• Encode Binary File as a Base64 String
• Four Types Of String-Literals In PowerShell
• Get The Computer Name In Windows
• Get Data From .ndjson File
• Get File Hash Using PowerShell
• Get Member Of .NET Class Without an Instance
• Get Root Path of a PSDrive
• Get Serial Number of a Computer
• Get WSMan Trusted Hosts
• macOS PowerShell Profile Locations
• Measure Execution Time of a Command
• Remove User Profile
• Show All Aliases For A Cmdlet
• Show Completion Options
• Show Zone Identifier For Files In Downloads Folder
• Sort IPv4 Addresses as Version
• Split and Join A Multiline String
• Use Advanced Math Methods and Constants

Python

• Create Enumeration In Python
• Create a Deep Copy of a Nested Object
• F-String Number Formatting
• Generate Secure Random Strings
• Get Character Sets From String Module
• Print Raw Text Characters
• Serve Current Directory Using HTTP
• Text or File Input Pattern for Argparse
• Use KDF to Hash Passwords

SSH

• Configure SSH Key To Work With GitHub

VBA

• Access Environment Variables in VBA
• Add Blank Line to the Immediate Window
• Use Immediate Window to Evaluate Code

VSCode

• VSCode Keyboard Shortcuts for macOS and Windows
• VSCode User Snippet Storage Location

VirtualBox

+Find VirtualBox Command Line Utilities

Windows

• Capture Network Traffic Across Reboot
• Change What Happens When I Close The Laptop Lid
• Find All Previously Connected Networks
• Find Configured DNS Servers Using CMD
• Fix User Profile Using Registry Edit
• Get OS Name and Version from CMD
• Install Applications Using Winget
• List Of File Explorer Alternatives
• Make Windows Prefer IPv4 Address Over IPv6
• Manually Boot To Audit Mode
• MSSQL Windows 10 Installation Notes
• Open Local Users and Groups Management
• Remove User Profile
• Setup New PC Using Winget
• Windows EventLog Logging Levels
• Windows Keyboard Shortcuts
• Wipe Drive Using Diskpart

About

Inspired by this repo jbranchaud/til