在ruby中运行系统命令并与其交互 [英] Run system command in ruby and interact with it

问题描述

我需要在命令行上运行一个命令，请求用户响应。如果它帮助命令是：

I need to run a command on the command-line that asks for a user response. In case it helps the command is:

gpg --recipient "Some Name" --encrypt ~/some_file.txt

当你运行这个时，它警告一些东西，然后询问：

when you run this, it warns about something then asks:

仍然使用此键？ （y / N）

Use this key anyway? (y/N)

回应'y'让我们正确完成。我一直在尝试使用 open4 gem ，但我无法获得它指定'y '正确。这是我尝试：

Responding 'y' let's it finish correctly. I have been trying to use the open4 gem but I have not been able to get it to specify the 'y' correctly. Here is what I tried:

Open4::popen4(cmd) do |pid, stdin, stdout, stderr|
  stdin.puts "y"
  stdin.close

  puts "pid        : #{ pid }"
  puts "stdout     : #{ stdout.read.strip }"
  puts "stderr     : #{ stderr.read.strip }"
end

我做错了什么？

推荐答案

Unix处理这些情况的方法是使用 expect ，Ruby提供内置支持：

The Unix way to handle these situations is with expect, which Ruby comes with built-in support for:

require 'pty'
require 'expect'

PTY.spawn("your command here") do |reader, writer|
  reader.expect(/Use this key anyway/, 5) # cont. in 5s if input doesn't match
  writer.puts('y')
  puts "cmd response: #{reader.gets}"
end

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