CuriousLearner/til

Collection of my daily learning

Python

TIL (Today I Learned)

"Byte-sized" 😏 snippets of things I learned 🤔

78 TILs 🤓 so far.

AWS

IGW vs. NAT – Understanding Private to Public IP Mapping - 2025-02-28
AWS reserves five IPs per subnet - 2023-02-12
No self-signed certificates in Cloudfront's SSL connection - 2023-02-12
ACM certificate should always be in us-east-1 for Cloudfront - 2023-02-12

Bash

Bash trap with ERR and EXIT for Error Handling - 2025-09-18

CLI

apt-get distclean for complete package cleanup - 2025-09-12
Netcat (nc) and Raw TCP Communication - 2025-03-01
Unzip overwrite and place content in a directory - 2025-02-10
envsubst command for substituting values in config files - 2024-07-28
Pass Arguments From Previous Command - 2023-07-19
Execute last command with sudo - 2023-02-13

CSS

Select by attr in list of values - 2024-04-22

Django

Managing Schema-less Migrations in Django with SeparateDatabaseAndState - 2025-05-16
Speed Up Django Admin with list_select_related - 2025-05-16
Understanding Django ForeignKey Fields - 2025-05-16
Isolate Redis cache for parallel tests - 2025-02-20
Fixing Coverage for Django's manage.py test --parallel - 2025-02-20
Using add_q in Django Queries - 2024-06-23
Add Multiple Objects In Queryset In Many To Many Relationship - 2024-06-23
Generate random secret key - 2024-06-03
Empty database - 2023-07-08
Use defer() to limit fields fetched from models - 2023-02-12
Redundant all chaining in queryset - 2023-02-12

Django Extensions

Print SQL on ORM queries - 2025-02-28

Docker

Filter list of docker containers - 2025-02-28
Target in Docker Compose File - 2024-07-28
Get rid of persistent volumes in docker compose down - 2024-06-23

Git

Stash Selective Changes in Git - 2025-02-20
Finding Git Commits That Touched a Specific File or String - 2025-02-20
Revert file(s) state to one in diff branch - 2024-07-28
git rev-parse for parsing Git revision information - 2024-04-18
git diff --name-only for file names only - 2024-04-18
git merge-base for common-ancestor commit - 2024-04-18
Ignore commits in git-blame view - 2023-02-13

Github

See git-blame for a file - 2023-02-13

Github Actions

Understanding Permissions in GitHub Actions - 2024-10-10
paths and paths-ignore filter for optimized Workflow run - 2024-10-10
Enable automatic inline annotations in PR using Ruff - 2023-02-13
Permissions for pushing to a repository - 2023-02-12

Go

Import package without using it via underscore (_) - 2024-06-23
Build tags in Golang - 2024-06-23

Make

Control make Behavior with MAKEFLAGS - 2025-02-20
Improve make Output Readability with --output-sync for Parallel Jobs - 2025-02-20
Speed Up Builds with make -j and Auto-Detect CPU Cores - 2025-02-20

Markdown

Markdown Alerts - 2024-07-28

Mastodon

Sending direct message on Mastodon - 2023-02-14

NPM

npm ci (clean install) for CI pipelines - 2025-02-28

PDF

Reduce file size of PDF files - 2023-03-15
Remove PDF Password - 2023-03-15

Poetry

Editable installation for a package - 2025-02-28
Generate requirements without hashes - 2025-02-28
Clear cache for resolving dependencies faster - 2023-02-16

PSQL

Restore database via template - 2024-06-23
Dump and Restore database - 2023-07-08

Pytest

Understanding pytest pythonpath and import-mode configuration - 2025-09-18
caplog vs syslog in pytest – What’s the Difference? - 2025-05-16
Run only failed tests and stop at first failure in pytest - 2025-03-04
Run tests that match substring in their name - 2025-02-28
Autouse fixtures for common test dependencies - 2025-02-28

Python

Update dependencies in requirements.txt - 2025-02-28
Handle CORS in a Simple HTTP Server - 2025-02-28
Expand home directory paths in pathlib.Path - 2024-06-23

React

Not to use && for conditional rendering - 2023-02-12

SSH

Setup SSH Tunneling - 2023-07-08

Terraform

Reading directly from environment variables - 2025-02-28
Zip Lambda code - 2024-09-06
Lifecycle Ignore changes - 2024-07-03

Terragrunt

Force unlock state file - 2024-09-06

VIM

Open a file on a particular line - 2023-02-13
Indent and De-indent lines in Vim. - 2023-02-13
Open file on a particular pattern in file - 2023-02-13
Use text objects to make efficient changes - 2023-02-13
Remove lines matching a pattern - 2023-02-13

VLC

Cast video to chromecast - 2023-02-13

Wagtail

Lazily Refer Snippet in blocks - 2025-02-28
Get blocks in StreamBlock using blocks_by_name & first_block_by_name - 2024-04-25
Many to Many relationship in Wagtail - 2024-04-25

Yml

YAML Anchor Tags using <<: and * Syntax - 2024-10-10

Resources

This repository is inspired from the following respositories: