Today I Learned / Cheat sheet

Categories

• AWS
• ELK Stack
• Git
• Javascript
• Linux
• Misc
• OS X
• PHP
• Photography
• Python
• Redis

AWS

• Count objects in S3 bucket

ELK Stack

• Change ElasticSearch index replica quantity
• Manually assign shards to nodes

Git

• Amend last commit message from command line
• Amend / replace author on old commits
• Change tab width when doing git diff
• Delete remote branch
• Display a pretty Git commit tree
• Pull newest changes, replacing local files

Javascript

• Check for the existence of something in a deeply nested object
• Convert string to a bit string / array
• Increment and initialize counter
• Restore a modified console object

Linux

• Append crontab row
• Bulk rename files using bash
• Change date of a file
• File manipulation using sed
• Find files by size
• Find largest X in path
• Show external IP
• Get a server/instance physical memory
• Create gzip files of each subdirectory
• Generate a histogram using awk
• Kill processes matching a string
• Redirect IPs requests
• Bulk restore missing file extensions
• Sorted file diff
• Unhide lots of . files

Misc

• Run a single rule with ESLint

OS X

• Change network mac address
• Delete a specific TimeMachine backup
• Exclude something from Dropbox
• List USB (lsusb) for OSX
• Prevent sleep with Caffiene
• Text to speech using say

PHP

• Return value of isset, otherwise return default value

Photography

• exiftool notes

Python

• Conditional exception handling
• Use Python to create a minimal HTTP server
• Use Python to make JSON pretty

Redis

• Allow writes while bgsave is failing
• #Redis Lua Bitmap to binary

Menu build script

To quickly create the table of contents based on the .md files found, run ./make_toc.sh

About

I shamelessly stole this idea from jbranchaud/til, who shamelessly stole it from thoughtbot/til.

License

© 2015-2022 Bray Almini

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