Accessing the return value of a ruby script in shell

Question

How do I access the value of variable a in test1.rb to use further in test1.rb outside SSH?

In test1.rb

Net::SSH.start("host", ava) do |ssh|
   ssh.exec('ruby test2.rb')
end

In host, test2.rb

#!/usr/bin/env ruby

class Value
  def get_value()
    a = 1 + 2
  end
end

v = Value.new
v.get_value()

Just write puts v.get_value().

Arup Rakshit
– Arup Rakshit

2014-01-17 22:11:17 +00:00
Commented Jan 17, 2014 at 22:11 — Arup Rakshit
– Arup Rakshit, Commented Jan 17, 2014 at 22:11
You can set a return code with exit: exit v.get_value()

knut
– knut

2014-01-17 22:16:04 +00:00
Commented Jan 17, 2014 at 22:16 — knut
– knut, Commented Jan 17, 2014 at 22:16
I want to use the value of a in rest of test1.rb

Ava
– Ava

2014-01-17 22:20:20 +00:00
Commented Jan 17, 2014 at 22:20 — Ava
– Ava, Commented Jan 17, 2014 at 22:20

DiegoSalazar · Accepted Answer · 2014-01-17 22:25:21Z

3

In your test1.rb script you need to pass a block to the ssh.exec method and in that block you will be able to access anything you puts from test2.rb

Net::SSH.start("127.0.0.1", 'ava', password: '') do |ssh|
  ssh.exec('ruby test2.rb') do |channel, stream, data|
    puts "got: #{data}" if stream == :stdout
  end
end

puts the value you want to pass to test1.rb from test2.rb:

v = Value.new
puts v.get_value()

That will send the value to stdout

More info in the readme: https://github.com/net-ssh/net-ssh#readme

answered Jan 17, 2014 at 22:25

DiegoSalazar

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