Ruby Open3.popen2e用法及代碼示例

popen2e(*cmd, &block)

Open3.popen2e 與 Open3.popen3 相似，隻是它合並了標準輸出流和標準錯誤流。

方塊形式：

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

有關可選散列參數 env 和 opts 的信息，請參見 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
  }
}