Run two ruby scripts from rake task

Question

So this is a simple rake task:

task :map_reduce do
  puts 'Running map reduce scripts...'
  ruby "#{PADRINO_ROOT}/map_reduce/raw_visits_map.rb '03-08-2016' 90" && ruby "#{PADRINO_ROOT}/map_reduce/raw_visits_reducer.rb"
end

The first script outputs the result in STDOUT to be further read by the so called 'reducer'. In the terminal, I am able to run those two scripts like:

ruby first_script.rb param1 param2 | ruby second_script.rb

So the second script can read from STDOUT like

res = ARGF

But how can I line up the 2 executions inside that rake task?

How I wrongfully tried it's not working.

It might be easier to require the ruby class directly into your rake task, but if you want to run a script from a rake task you can run any shell code in Ruby using backticks, like this: `\`ruby first_script.rb param1 param2 | ruby second_script.rb\`` — omnikron, Sep 20 '16 at 10:55
@omnikron thanks mate, worked like a charm :) write it as an answer and I'll accept it. Cheers! — Bogdan Popa, Sep 20 '16 at 10:58

omnikron · Accepted Answer · 2016-10-19T21:37:05.743

2

It might be easier to require the ruby class directly into your rake task, but if you want to run a script from a rake task you can run any shell code in Ruby using backticks, like this:

`ruby first_script.rb param1 param2 | ruby second_script.rb`

edited Oct 19 '16 at 21:37

answered Sep 20 '16 at 10:59

omnikron

2,211
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score 1 · Answer 2 · edited May 22 '18 at 23:31

1

Perhaps you should use backticks or the %x syntax.

Also see answers to: Ruby, Difference between exec, system and %x() or Backticks

edited May 22 '18 at 23:31

William Price

4,033
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answered Sep 20 '16 at 10:57

mrstebo

911
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Run two ruby scripts from rake task

2 Answers2