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## Awesome Guidelines
https://github.com/Kristories/awesome-guidelines

## List of Free Learning Resources
https://github.com/EbookFoundation/free-programming-books

## Angular 2+ Components & Libraries
https://github.com/brillout/awesome-angular-components

## বাংলায় শেল ও শেলস্ক্রিপ্টিং শেখার কোর্স https://sh.howtocode.com.bd

mshRoR

# Refresh ubuntu keys server
$ sudo apt-key adv --refresh-keys --keyserver keyserver.ubuntu.com

# Group permission change
$ sudo chgrp -R root esdata

# Add current login User ID to .bashrc or .zshrc file
$ echo "export UID=$UID" >> ~/.bashrc
or
$ echo "export UID=$UID" >> ~/.zshrc

mshRoR

## python 3.7 install
-> sudo apt update
-> sudo apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev wget
-> sudo apt install software-properties-common
-> sudo add-apt-repository ppa:deadsnakes/ppa
-> sudo apt update
-> sudo apt install python3.7
-> python3.7 --version

## pip3 install

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If you want to run docker as non-root user then you need to add it to the docker group.
1. Create the docker group if it does not exist
  $ sudo groupadd docker
2. Add your user to the docker group.
  $ sudo usermod -aG docker $USER
3. Run the following command or Logout and login again and run (that doesn't work you may need to reboot your machine first)
  $ newgrp docker
4. Check if docker can be run without root
  $ docker run hello-world
  

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# Check server process is using jemalloc
# ref. [Japanese] https://tech.studyplus.co.jp/entry/2019/09/09/094140
class AppController < ActionController::Base
  def show
    r = `strings /proc/#{Process.pid}/maps | grep jemalloc`
    render plain: "<h1>#{ENV['LD_PRELOAD'].presence || 'empty'}</h1><pre>#{r}</pre>"
  end
end

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# spin up our new (empty) database
docker compose up -d db_postgres_151

# login to postgres
$ psql -U postgres
$ CREATE DATABASE database_name

# dump our existing database
docker compose exec -it db_postgres_146 /bin/bash -c 'pg_dumpall -U $POSTGRES_USER > /backup/20230127.sql'

mshRoR

# Call scopes directly from your URL params:
#
#     @products = Product.filter(params.slice(:status, :location, :starts_with))
module Filterable
  extend ActiveSupport::Concern

  module ClassMethods
    
    # Call the class methods with names based on the keys in <tt>filtering_params</tt>
    # with their associated values. For example, "{ status: 'delayed' }" would call 

mshRoR

PostgreSQL is Enough

• Simplify: move code into database functions
• Just Use Postgres for Everything
• PostgreSQL is the worlds’ best database
• Hacker News discussion

Background and Cron Jobs

• https://github.com/citusdata/pg_cron