Ralat semasa melaksanakan skrip ruby

Question

/usr/local/lib/ruby/gems/2.1.0/gems/json-2.1.0/lib/json/common.rb:156:in `parse': 765: token yang tidak dijangka pada 'decode() argument 1 mestilah rentetan, bukan Tiada (JSON::ParserError)

ruby ​​​​xxx.rb boleh dilaksanakan seperti biasa dalam terminal, tetapi ralat ini digesa apabila halaman jenkins melaksanakan shell. Kod ruby ​​​​adalah seperti berikut:

#!/usr/bin/env ruby

require 'json'

cmd = "/usr/local/bin/aliyuncli ecs DescribeInstances --output json --PageSize 50 - -RegionId "

RegionIds = ["cn-hangzhou","cn-qingdao","cn-beijing","cn-hongkong","cn-shenzhen","us-west-1"]

RegionIds. setiap melakukan |regionid|.

data = `#{cmd} #{regionid}`

data = JSON.parse(data)

data["Instances"]["Instance"].setiap {|instance|print instance ["RegionId"] ," ",instance["InstanceName"]," ",instance["PublicIpAddress"]["IpAddress"][0]," ",instance["InnerIpAddress"]["IpAddress"][0 ],"n" }

#meletakkan data

end