From: James Gray <james@...>
Date: 2007-12-27T13:30:24+09:00
Subject: Re: Capturing error msgs from output = `cmd`

On Dec 26, 2007, at 9:03 PM, Tim Hunter wrote:

> Victor Reyes wrote:
>> Hello Team,
>> I wrote the simple piece of code below which under "normal"  
>> circumstances it
>> works fine.
>> If, however, the command executed generates an error msg, the error  
>> is
>> displayed on the screen.
>> This is a behaviour which I don't want.
>> I would like to capture ALL output generated by the command and  
>> return it to
>> the caller.
>> I tried different tricks but nothing worked. The question is:
>> How can I capture ALL output from line: *userCMD_output = `#{input}`*
>> including stderr???
>>
>
> When you use backticks to capture the output from a command, what  
> you get is whatever the command writes to stdout. If the command  
> writes an error message to stderr you can't capture it.

Well, you could fold STDERR into STDOUT.  In my Unix shell that's done  
with:

   `#{cmd} 2>&1`

Hope that helps.

James Edward Gray II