Ruby

Ruby adventures...

Install

Using package manager

Install Ruby using OS package manager it's rarely making usable for projects.

sudo apt-get install ruby ruby-dev

RVM Ruby Version Manager

# Install RVM - Ruby Version Manager
sudo apt-get install -y curl gnupg2 build-essential
gpg2 --keyserver hkp://pool.sks-keyservers.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB

# Install RVM stable with ruby:
curl -sSL https://get.rvm.io | bash -s stable --ruby # can take ~10 min as it's compiling sources

To start using RVM you need to run source /home/vagrant/.rvm/scripts/rvm in all your open shell windows, in rare cases you need to reopen all shell windows.

source /home/vagrant/.rvm/scripts/rvm #this in U18 adds following to your env
export PATH=$PATH:/home/vagrant/.rvm/bin #adds local rvm bin to your user path
rvm_user_install_flag=1
rvm_stored_umask=0002
rvm_loaded_flag=1

# Optional: sudo usermod -a -G rvm `whoami`

Use RVM to install Ruby version you want ruby-X.X.X

• this will search your package management for version you ask if not found
• will download sources and get it compiled
• will remove undesired packages, rg. U18 libssl-dev to install libssl1.0-dev instead

rvm install ruby-2.1.0
rvm --default use ruby-X.X.X

1. Install Bundler

gem install bundler --no-rdoc --no-ri </source>

Install dependencies, uses project's Gemfile

bundler install        #installs gems and their dependencies
bundler install --path #installs gems in ./path dir, much easier to remove them if something is wrong
                       #creates .bundle/config file that contains path to gems

Control your gem bundles and other ussefulness

bundle info kwalify  #display where a gem got installed
  * kwalify (0.7.2)
        Summary: a parser, schema validator, and data-binding tool for YAML and JSON.
        Homepage: http://www.kuwata-lab.com/kwalify/
        Path: /home/vagrant/.rvm/gems/ruby-2.6.0/gems/kwalify-0.7.2

ruby -S gem list --local  #list all gems

Basic file structure

#!/usr/bin/env ruby

# require 'yaml'
require 'fileutils'

file_name="file.txt"

# #{file_name} -: string interpolation
FileUtils.touch("#{file_name}.OK")

The require dependencies need to be installed using

sudo apt  install ruby-bundler
bundle install       #default, but NEVER RUN AS SUDO
bundle install -path #installs gems into ~/.path/