Getting started with ruby

A lightning talk for Eindhoven.rb about getting started with various command-line options for the ruby program.

Transcript

1. Getting started with ruby Eindhoven.rb #4 — 5 april 2011 Arjan van der Gaag
2. Getting started with Ruby Eindhoven.rb #4 — 5 april 2011 Arjan van der Gaag
3. Getting started with Ruby Eindhoven.rb #4 — 5 april 2011 Arjan van der Gaag
4. Getting started with ruby Eindhoven.rb #4 — 5 april 2011 Arjan van der Gaag
6. $ ruby app.rb
7. $ ruby app.rb $ ruby -r “mylib” app.rb
8. $ ruby app.rb $ ruby -r “mylib” app.rb $ ruby -rubygems app.rb
9. $ ruby app.rb $ ruby -r “mylib” app.rb $ ruby -rubygems app.rb $ ruby -I lib app.rb
10. # lib/post.rb class Post attr_accessor :title, :author end # app.rb require "post" get '/' do @posts = Post.all erb :index end $ ruby -rubygems -r sinatra -I lib app.rb
12. $ ruby -e ‘puts “Hello, world”’
13. $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb
14. while gets # execute app.rb here end
15. while $_ = gets # execute app.rb here end
16. $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb
17. $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb $ ruby -p app.rb
18. while gets # execute app.rb here print end
19. while $_ = gets # execute app.rb here print $_ end
20. $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb $ ruby -p app.rb
21. $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb $ ruby -p app.rb $ ruby -lpe app.rb
22. while gets $_.chomp! # execute app.rb here print end
23. $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb $ ruby -p app.rb $ ruby -lpe app.rb
24. $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb $ ruby -p app.rb $ ruby -lpe app.rb $ ruby -pe “next unless /<{7}/../>{7}/” conflicted_file
25. $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb $ ruby -p app.rb $ ruby -lpe app.rb $ ruby -pe “next unless /<{7}/../>{7}/” conflicted_file $ ruby -an -F, -e ‘puts $F[0]‘ csv_file
26. while gets $F = $_.split $, # execute app.rb here end
27. $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb $ ruby -p app.rb $ ruby -lpe app.rb $ ruby -pe “next unless /<{7}/../>{7}/” conflicted_file $ ruby -an -F, -e ‘puts $F[0]‘ csv_file
28. $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb $ ruby -p app.rb $ ruby -lpe app.rb $ ruby -pe “next unless /<{7}/../>{7}/” conflicted_file $ ruby -an -F, -e ‘puts $F[0]‘ csv_file $ ruby -i -p -e ‘$_.downcase!’ file
29. #!/usr/bin/env ruby -w # Example input: # # john,secret # graham,test require 'digest' while line = ARGF.gets("\n") do parts = line.split ',' next unless parts[1] print line.gsub parts[1], Digest::SHA1.hexdigest(parts[1]) end
30. #!/usr/bin/env ruby -wanp -r digest -F, next unless $F[1] gsub $F[1], Digest::SHA1.hexdigest($F[1])
31. # Read all values in ARGV as files as # a single stream OR read from STDIN puts ARGF.read puts $<.read
32. - $/ input record separator (default \n) - $\ output record separator (default \n) - $, output field separator (default nil) - $; input field separator (default nil) - $_ current line - $. number of current line - $F result of $_.split($;) Ruby globals
33. - OptParse - StrScanner - OpenStruct - Set - CSV - Find - FileUtils - Tmpfile - Zlib - Abbrev Know your StdLib
35. $ ruby -h
36. github.com/avdgaag @avdgaag