Today I Learned

A collection of concise write-ups on small things I learn day to day across a variety of languages and technologies. These are things that don't really warrant a full blog post.

57 TILs and counting...

• Bash
• Docker
• Git
• GitHub
• lang-cs
• lang-python
• linux
• macOS
• Naming Conventions
• Powershell
• Regular Expressions
• rsync Recipes
• SSH
• TLS
• Unix
• wget Recipes

• Appending and Composing Arrays
• Arrays of strings and lines of text
• Display a string as hex or escaped characters
• Find command with variable paths list
• How to create and safely use a temporary directory
• How to return a value from a function
• Make an array containing the files in a directory
• Pass arguments to a command alias
• Test whether a command exists
• Trim whitespace from variable

• Adding a tag to an existing image
• List the mounted volumes of a container
• Listing images with a specific label
• Listing the labels of an image (or container or task)
• Open a shell in a running container
• Remove orphaned images

• Add a submodule repository
• Add a remote for the original repo of a forked repo
• Compare two branches
• Compare working file with another branch
• Copy file from another branch
• Git steps after completing a topic branch
• List the files in a commit
• Merge file from another branch
• Remove large objects from a git repo

• Copy a new upstream remote branch to the origin remote
• Delete a topic branch
• Push a new local branch to a remote Git repository and track it too
• Push an existing repo to GitHub

• How to grant a unit tests access to internal types

• HTTPie: Verify HTTPS connection with system CA bundle
• Produce console output from a unit test
• Setting up the Flask development server to use HTTPS

• Keeping an Ubuntu system patched
• Listing installed packages on Ubuntu
• Ubuntu Desktop keyboard shortcuts HUD
• Pairing a Logitech wireless mouse on Ubuntu Desktop

• Giving a standard user account SUDO rights
• Preventing Spotlight from indexing removable thumb drives

• Semantic Versioning

• Returning a collection as an object
• Sending ouput to /dev/null

• Convert camelCased names to Python names

• Ignore modification time when pushing changes
• Mirror one local folder to another

• (ssh client) Associate a pseudo-hostname with an SSH key
• (ssh server) Permit only SSH key authentication

• Add a CA certificate to the OS X keychain
• Add CA certificate to Firefox
• Add CA certificates to Linux system CA certificate store
• Create a CA cert on local machine
• Create server certificate (using local CA)

• Creating a soft link to a directory
• How much data is in a directory

• Society of Mind - Marvin Minsky
• Works of George Orwell

Inspired by jbranchaud/til who "shamelessly stole this idea from thoughtbot/til".

• Today I Learned by Hashrocket
• jwworth/til
• thoughtbot/til
• jbranchaud/til

© 2016 Dave Hein
© 2017 Dave Hein

This work by Dave Hein is licensed under a Creative Commons Attribution 4.0 International License.