Ruby Open3.popen2e用法及代码示例

popen2e(*cmd, &block)

Open3.popen2e 与 Open3.popen3 相似，只是它合并了标准输出流和标准错误流。

方块形式：

Open3.popen2e([env,] cmd... [, opts]) {|stdin, stdout_and_stderr, wait_thr|
  pid = wait_thr.pid # pid of the started process.
  ...
  exit_status = wait_thr.value # Process::Status object returned.
}

非阻塞形式：

stdin, stdout_and_stderr, wait_thr = Open3.popen2e([env,] cmd... [, opts])
...
stdin.close  # stdin and stdout_and_stderr should be closed explicitly in this form.
stdout_and_stderr.close

有关可选散列参数 env 和 opts 的信息，请参见 Process.spawn 。

例子：

# check gcc warnings
source = "foo.c"
Open3.popen2e("gcc", "-Wall", source) {|i,oe,t|
  oe.each {|line|
    if /warning/ =~ line
      ...
    end
  }
}