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Getting started with ruby Eindhoven.rb #4 — 5 april 2011 Arjan van der Gaag

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Getting started with Ruby Eindhoven.rb #4 — 5 april 2011 Arjan van der Gaag

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Getting started with Ruby Eindhoven.rb #4 — 5 april 2011 Arjan van der Gaag

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Getting started with ruby Eindhoven.rb #4 — 5 april 2011 Arjan van der Gaag

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$ ruby app.rb

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$ ruby app.rb $ ruby -r “mylib” app.rb

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$ ruby app.rb $ ruby -r “mylib” app.rb $ ruby -rubygems app.rb

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$ ruby app.rb $ ruby -r “mylib” app.rb $ ruby -rubygems app.rb $ ruby -I lib app.rb

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# 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

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$ ruby -e ‘puts “Hello, world”’

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$ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb

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while gets # execute app.rb here end

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while $_ = gets # execute app.rb here end

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$ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb

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$ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb $ ruby -p app.rb

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while gets # execute app.rb here print end

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while $_ = gets # execute app.rb here print $_ end

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$ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb $ ruby -p app.rb

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$ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb $ ruby -p app.rb $ ruby -lpe app.rb

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while gets $_.chomp! # execute app.rb here print end

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$ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb $ ruby -p app.rb $ ruby -lpe app.rb

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$ 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

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$ 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

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while gets $F = $_.split $, # execute app.rb here end

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$ 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

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$ 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

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#!/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

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#!/usr/bin/env ruby -wanp -r digest -F, next unless $F[1] gsub $F[1], Digest::SHA1.hexdigest($F[1])

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# Read all values in ARGV as files as # a single stream OR read from STDIN puts ARGF.read puts $<.read

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- $/ 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

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- OptParse - StrScanner - OpenStruct - Set - CSV - Find - FileUtils - Tmpfile - Zlib - Abbrev Know your StdLib

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$ ruby -h

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github.com/avdgaag @avdgaag