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From: Peter Otten <__peter__@web.de>
Subject: Re: Using sh library with grep command
Date: Sat, 23 Nov 2013 17:29:36 +0100
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Luca wrote:

> I'm trying to use sh (https://pypi.python.org/pypi/sh) for calling
> system grep command but it's now working as expected.
> 
> An example:
> 
>     import sh
>     sh.grep('abc', os.getcwd(), '-r')
> 
> But I get the ErrorReturnCode_1: exception, that I learned is the
> normal exit code for grep command when it not found any match.
> 
> The error instance object reported that the command run is:
> 
>     *** ErrorReturnCode_1:
>       RAN: '/usr/bin/grep abc /Users/keul/test_sh'
> 
> Obviously manually running the command I get some output and exit code 0.
> 
> Where I'm wrong?

Did you run grep with or without the -r option? 

The code sample and the error message don't match. Maybe you accidentally 
left out the -r in your actual code.