Ruby Open3.pipeline_w用法及代码示例

pipeline_w(*cmds, &block)

Open3.pipeline_w 将命令列表作为管道启动，管道连接到第一个命令的标准输入。

Open3.pipeline_w(cmd1, cmd2, ... [, opts]) {|first_stdin, wait_threads|
  ...
}

first_stdin, wait_threads = Open3.pipeline_w(cmd1, cmd2, ... [, opts])
...
first_stdin.close

每个 cmd 都是一个字符串或一个数组。如果它是一个数组，则将元素传递给 Process.spawn 。

cmd:
  commandline                              command line string which is passed to a shell
  [env, commandline, opts]                 command line string which is passed to a shell
  [env, cmdname, arg1, ..., opts]          command name and one or more arguments (no shell)
  [env, [cmdname, argv0], arg1, ..., opts] command name and arguments including argv[0] (no shell)

Note that env and opts are optional, as for Process.spawn.

例子：

Open3.pipeline_w("bzip2 -c", :out=>"/tmp/hello.bz2") {|i, ts|
  i.puts "hello"
}