Ruby Scripts To Make Life Easier

Introduction to subprocesses and how to use them for everyday use.

Transcript

1. Ruby Scripts to Make Life Easier
   #MakeRubyGreatAgain
   

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2. @PauloAncheta
   

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3. We make alias-es all the
   time. We should make
   something more useful.
   

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4. # talk.rb
   system “echo hello world”
   $ ruby talk.rb
   hello world
   

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5. # talk*
   #! bin/env ruby
   `echo hello world`
   $ mv talk.rb talk
   $ chmod u+x talk
   $ ./talk
   hello world
   

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6. # talk*
   #! bin/env ruby
   string = “hello world”
   `echo #{string}`
   $ ./talk
   hello world
   

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7. # talk*
   #! bin/env ruby
   string = “hello world”
   `echo #{string.gsub(/world/,
   “VanRuby”) } | grep file.txt`
   $ ./talk | more file.txt
   hello VanRuby
   

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8. $ irb
   irb(main):001:0> files = `ls`
   =>
   “Applications\nDesktop\nDocuments\nDow
   nloads\nLibrary\nMovies\nMusic\nPictur
   es\nPublic\ntalk\n”
   irb(main):002:0> files.class
   => String
   

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9. irb(main):003:0> system `ls`
   => true
   

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10. All of that is great. How
    can I be productive
    doe?
    

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11. # clean-pg*
    #! bin/env ruby
    pg = `ps aux | grep postgres | grep waiting`
    pg = pg.split(/\n/)
    pg.each do |waiting|
    # ... some process to get the pid
    `kill #{pid}`
    end
    

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12. # split-branch*
    #! bin/env ruby
    # commits => 1z2y3 TICKET-number msg
    specific_commits = `git log - -pretty - -oneline | grep
    #{ARGV}`
    `git checkout master && git pull origin master && git
    checkout -b test-branch`
    specific_commits.each do |commit|
    sha = commit[0..6] # => [123asdf, qwer456, … ]
    `git cherry-pick #{sha}`
    end
    

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13. #MakeRubyGreatAgain
    

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