From: jqwoods@...
Date: 2008-03-15T03:44:59+09:00
Subject: Re: How to separate stdout & stderr from executed shell command

On Mar 14, 11:40 am, jqwo...@gmail.com wrote:
> I would like to create a method which executes a given shell command
> and returns an array containing three things: 1) stdout of the command
> as a string, 2) stderr of the command as a string, and 3) the exit
> status. I'm having trouble figuring out how to get stdout and stderr
> as separate output.
>
> Here's an illustration of the desired result I'm after:
>
>   irb> my_exec_command("ls existant_file")
>   => ["existant_file\n", "", 0]
>
>   irb> my_exec_command("ls NON_existant_file")
>   => ["", "ls: NON_existant_file: No such file or directory\n", 2]
>
> Any pointers on how to implement my_exec_command?

PS: Unless there's a simpler way, if someone could just point me to an
API that provides stdout and stderr of sub-processes as IO objects, I
could probably figure it out from there. Thanks!