Ruby怎样传递参数给子进程(最简单的进程之间通信方法)

yanzilee

于 2011-09-27 13:25:57 发布

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分类专栏： ruby 文章标签： ruby c# shell

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本文介绍如何在Ruby中使用环境变量，通过示例展示了如何在主进程设置环境变量，并在子进程中读取这些变量。此外，还解释了修改环境变量只会影响当前脚本的子进程。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

1. 主进程main.rb

ENV["ttt"]="yanzilee9292"
system 'ruby t.rb'

2.子进程t.rb

puts ENV["ttt"]

3.运行

ruby main.rb

这样控制台会打印出yanzilee9292

参考: http://ruby.about.com/od/rubyfeatures/a/envvar.htm

Environment variables are variables passed to programs by the command line or the graphical shell. Though there are a number of environment variables that only affect the command line or graphical shell itself (such as PATH or HOME), there are also several that directly affect how Ruby scripts execute.

Accessing Environment Variables from Ruby

Ruby has direct access to environment variables via the ENV hash. Environment variables can be directly read or written to by using the index operator with a string argument. Note that writing to environment variables will only have an effect on child processes of the Ruby script. Other invocations of the script will not see the changes in environment variables.