jay3126

Bash Scripting:

Managing Pathnames in Multi-file Bash Projects

Paths can get somewhat muddled up when you execute a Bash script with dependencies. Each script, when executed, is executed at a certain location as demonstrated by echoing pwd from the script. This is the directory assumed if ever you try to source (aka .) from that script.

This location is subject to change as it traces back to the ORIGINAL caller. By "ORIGINAL" I don't mean the location script that called it, or even the location of the script that called the script that called it, I mean the working directory of the first to initiate the chain of calls, which might be the user in the terminal or the location of the clicked executable.

Thing to consider:

1. The caller's location

jay3126

• Install
• Shell exports
• Directory explanations
• Automatic Imports
• Private repo access
• Guard (automatic go run)
• Godo
• Spurious
• AWS SDK with Go (inc. some old possibly broken examples)
• Build and Compilation

jay3126

So i was using Rails 4.1 with Unicorn v4.8.2 and when i tried to deploy my app it doesn't start properly and into the unicorn.log file i found this error message:

  "app error: Missing `secret_key_base` for 'production' environment, set this value in `config/secrets.yml` (RuntimeError)"

After a little research i found that Rails 4.1 change the way to manage the secret_key, so if we read the secrets.yml file located at exampleRailsProject/config/secrets.yml (you need to replace "exampleRailsProject" for your project name) you will find something like this:
  
  # Do not keep production secrets in the repository,
  # instead read values from the environment.
  production:
    secret_key_base: <%= ENV["SECRET_KEY_BASE"] %>

jay3126

module RandomPassword
  def generate
    # create a one big array of seeding data
    seed = [('a'..'z'), ('!'..'+'), (1..9), ('A'..'Z')].map { |e| e.to_a }.flatten
    # get random 16 characters from this array
    original = (0..16).map { seed[rand(seed.length)] }.join
    # just to be sure, randomize them once more
    original.split('').shuffle.join
  end
end

jay3126

# Set variables in .bashrc file

# don't forget to change your path correctly!

export GOPATH=$HOME/golang
export GOROOT=/usr/local/opt/go/libexec
export PATH=$PATH:$GOPATH/bin
export PATH=$PATH:$GOROOT/bin

jay3126

Magic words:

psql -U postgres

Most \d commands support additional param of __schema__.name__ and accept wildcards like *.*

• \q: Quit/Exit
• \c __database__: Connect to a database
• \d __table__: Show table definition including triggers

jay3126

require "rubygems"
require "octokit" # gem install octokit

1.upto(5) do |page|
  Octokit.repositories("railscasts", page: page, per_page: 100).each do |repo|
    system "git clone git://github.com/railscasts/#{repo.name}"
  end
end

jay3126

require 'rss'
require 'open-uri'
 
p "Downloading rss index"
 
# If you are a Railscasts Pro subscriber, you will have a different RSS feed with Pro casts
# If this is the case, go to http://railscasts.com/, find it and sub it below
rss_string = open('http://feeds.feedburner.com/railscasts').read
rss = RSS::Parser.parse(rss_string, false)
videos_urls = rss.items.map { |it| it.enclosure.url }.reverse

jay3126

#!/usr/bin/ruby
require 'rss'

p 'Downloading rss index'

rss_string = open('http://feeds.feedburner.com/railscasts').read
rss = RSS::Parser.parse(rss_string, false)
videos_urls = rss.items.map { |it| it.enclosure.url }.reverse

videos_filenames = videos_urls.map {|url| url.split('/').last }

jay3126

#!/usr/local/bin/ruby

# A script to download the latest episodes from railscasts.com
#
# author: modsaid <mahmoud@modsaid.com>
# mechanize support: Hossam Hammady <github@hammady.net>
#   gem install mechanize

require 'rubygems'
require 'mechanize'