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$ chef-client -version Chef: 12.4.1

$ curl -L https://www.opscode.com/chef/install.sh | sudo bash

$ chef-client -version Chef: 13.2.20

or

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show processlist; https://dev.mysql.com/doc/refman/5.7/en/show-processlist.html

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Install sphinx to use mysql in macOS

brew install sphinx --with-mysql

Re-install sphinx to use mysql in macOS

brew reinstall sphinx --mysql

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# Simple approach to sending email from the Rails console
# Implementation idea courtesy of Steve Klabnik
# http://blog.steveklabnik.com/posts/2012-09-09-random-ruby-tricks--class-new

# Create the mailer class with a block and assign to a variable
mailer = Class.new(ActionMailer::Base) do
  def example_message
    mail(to: "[email protected]", from: "[email protected]", subject: "Example Message") do |format|
      format.text { render text: "Example message body" }
    end

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AWS region code	AWS region name	Number of AZs	AZ names
us-east-1	Virginia	4	us-east-1a, us-east-1b, us-east-1c, us-east-1e
us-west-1	N. California	2	us-west-1a, us-west-1b
us-west-2	Oregon	3	us-west-2a, us-west-2b, us-west-2c
eu-west-1	Ireland	3	eu-west-1a, eu-west-1b, eu-west-1c
eu-central-1	Frankfurt	2	eu-central-1a, eu-central-1b
ap-southeast-1	Singapore	2	ap-southeast-1a, ap-southeast-1b
ap-southeast-2	Sydney	2	ap-southeast-2a, ap-southeast-2b, ap-southeast-2c
ap-northeast-1	Tokyo	2	ap-northeast-1a, ap-nort

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Install MySQL on macOS Sierra

This procedure explains how to install MySQL using Homebrew on macOS Sierra 10.12

Install Homebrew

• Installing Homebrew is effortless, open Terminal and enter :
  $ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
• Note: Homebrew will download and install Command Line Tools for Xcode 8.0 as part of the installation process.

Install MySQL

At this time of writing, Homebrew has MySQL version 5.7.15 as default formulae in its main repository :

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$1, $2, $3, ... are the positional parameters.
"$@" is an array-like construct of all positional parameters, {$1, $2, $3 ...}.
"$*" is the IFS expansion of all positional parameters, $1 $2 $3 ....
$# is the number of positional parameters.
$- current options set for the shell.
$$ pid of the current shell (not subshell).
$_ most recent parameter (or the abs path of the command to start the current shell immediately after startup).
$IFS is the (input) field separator.
$? is the most recent foreground pipeline exit status.

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ls $rvm_path/archives/

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setting autocorrect from git commands

git config --global help.autocorrect 1

ex:

git pulll origin master

WARNING: You called a Git command named 'pulll', which does not exist. Continuing under the assumption that you meant 'pull' in 0.1 seconds automatically...

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<?php

$cb = function ($fn) {
    return $fn;
};

echo <<<HEREDOC
Hello, {$cb(ucfirst('world'))}
HEREDOC;