Building CLI apps with Ruby

A presentation on Ruby CLI apps at Linux Weekend
https://gist.github.com/aziflaj/d4f82aaf05e8293c08ae79f9b30af35b

Transcript

1. Building CLI apps with Ruby Aldo Ziflaj // @aziflaj Linux Weekend
2. Building CLI apps with Ruby Aldo Ziflaj // @aziflaj Linux Weekend (GNU/Linux Weekend?)
4. Two of the most famous products of Berkeley are LSD and Unix. I don’t think that this is a coincidence. Anonymous
6. Elegant Weapon for a more Civilized Age $ # Kill every Google app $ ps aux | grep google | grep -v grep | awk '{ print $2 }' | xargs kill -15
7. Elegant Weapon for a more Civilized Age $ # Kill every Google app $ ps aux | grep google | grep -v grep | awk '{ print $2 }' | xargs kill -15 ps: process status
8. Elegant Weapon for a more Civilized Age $ # Kill every Google app $ ps aux | grep google | grep -v grep | awk '{ print $2 }' | xargs kill -15 ps: process status grep: globally search a regular expression and print
9. Elegant Weapon for a more Civilized Age $ # Kill every Google app $ ps aux | grep google | grep -v grep | awk '{ print $2 }' | xargs kill -15 ps: process status grep: globally search a regular expression and print awk: Text processing & Data extraction
10. Elegant Weapon for a more Civilized Age $ # Kill every Google app $ ps aux | grep google | grep -v grep | awk '{ print $2 }' | xargs kill -15 ps: process status grep: globally search a regular expression and print awk: Text processing & Data extraction kill: Save a .docx document
12. Elegant Weapon for a more Civilized Age $ # Fork bomb $ :(){ :|: & };:
15. Create the project $ mkdir dolittle && cd $_ $ bundle init $ echo gem \'thor\' >> Gemfile $ bundle install $ touch dolittle
16. #!/usr/bin/env ruby greeter = ARGV[0] || 'World' puts "Hello #{greeter}" $ chmod +x dolittle
17. #!/usr/bin/env ruby require 'thor' class Dolittle < Thor desc 'hello [GREETER]', 'adds a new task' def hello(greeter = 'World') puts "Hello #{greeter}" end end Dolittle.start(ARGV)
18. def initialize(*args) super @file = File.open('todolist.dat', 'a+') end desc 'add TASK', 'adds a new task' def add(task) @file.puts task end
19. desc 'list', 'list all tasks' def list @file.readlines.each_with_index do |line, index| puts "#{index + 1} => #{line}" end end
20. desc 'done TASK', 'delete a task' def done(task_index) `sed -i '#{task_index}d' #{File.basename(@file)}` end
21. $ sudo halt