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#
# Sidekiq auto start using systemd unit file for Ubuntu 16.04
#
# Put this in /lib/systemd/system (Ubuntu).
# Run:
#   1. systemctl enable sidekiq (to enable sidekiq service)
#   2. systemctl {start,stop,restart} sidekiq (to start sidekiq service)
#
# This file corresponds to a single Sidekiq process.  Add multiple copies
# to run multiple processes (sidekiq-1, sidekiq-2, etc).

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# About Aliases:
alias ls='ls --color=auto -F'
alias grep='grep --color=auto'
alias fgrep='fgrep --color=auto'
alias egrep='egrep --color=auto'
alias ll='ls -alF'
alias la='ls -A'
alias l='ls -CF'
alias less="less -R "

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Install and Create Emulators using AVDMANAGER and SDKMANAGER

TL;DR

For generic skin emulator with default apis (without google apis):

1. List All System Images Available for Download: sdkmanager --list | grep system-images

2. Download Image: sdkmanager --install "system-images;android-29;default;x86"

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// Error Codes for SignUp

ERROR_OPERATION_NOT_ALLOWED` - Indicates that Anonymous accounts are not enabled.
ERROR_WEAK_PASSWORD - If the password is not strong enough.
ERROR_INVALID_EMAIL` - If the email address is malformed.  
ERROR_EMAIL_ALREADY_IN_USE - If the email is already in use by a different account. 
ERROR_INVALID_CREDENTIAL` - If the [email] address is malformed.
  
  // sending password reset email
ERROR_INVALID_EMAIL` - If the [email] address is malformed.

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#1===========First code================

#!/usr/bin/env ruby

databases = {
    :local_db => {
      :database => 'my_db',
      :username => 'root',
      :password => 'admin',
      :host => 'localhost'

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# mysql db backup and restore for rails
# by David Lowenfels <david@internautdesign.com>  4/2011

require 'yaml'

namespace :db do
  def backup_prep
    @directory = File.join(RAILS_ROOT, 'db', 'backup')
    @db = YAML::load( File.open( File.join(RAILS_ROOT, 'config', 'database.yml') ) )[ RAILS_ENV ]
    @db_params = "-u #{@db['username']} #{@db['database']}"

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1. Select which branch to deploy to

     alias deploy='deploy_webport_to_qa'
     function deploy_webport_to_qa {
       BRANCH=$1
       if [ "$BRANCH" = "" ]; then
         BRANCH=$(git branch --show-current)
         echo "No branch specified."
         echo "Using currently checked out: $BRANCH"

echo "Press enter to continue or ctl-c to quit"

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• How to generate a QR code with ruby script

require 'rqrcode'

# qrcode = RQRCode::QRCode.new("mailto:<mwmaki2@gmail.com>?query")
qrcode = RQRCode::QRCode.new("")

png = qrcode.as_png(
  bit_depth: 1,
 border_modules: 4,

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HTTP status code symbols for Rails

Thanks to Cody Fauser for this list of HTTP responce codes and their Ruby on Rails symbol mappings.

Status Code Symbol
1xx Informational
100 :continue
101 :switching_protocols
102 :processing

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# Traversing arrays and objects in CoffeeScript

# The array and object we use for testing
arr = [1, 2, 3, 4, 5]
obj = {a: 1, b: 2, c: 3, d: 4, e: 5}


# 'in' has a different meaning in CoffeeScript than in JavaScript
# CS: element in array -> JS: array.indexOf(element) >= 0
console.log '5 in arr: ' + (5 in arr)