On 13 May 2011 10:44, Robert Klemme <shortcutter / googlemail.com> wrote:
> On Thu, May 12, 2011 at 6:05 PM, Michal Suchanek <hramrach / centrum.cz> wrote:
>> how do you write an equivalent of
>>
>> $ cmdA | cmdB | cmdC
>>
>> in Ruby?
>>
>> Specifically, I would like to see the PID, return value and stderr of
>> each of these commands but I would like cmdB to read the stdout of
>> cmdA directly, on its stdin, and similarily for cmdC and cmdB.
>>
>> Here I am not interested in feeding cmdA some particular input (eg. it
>> can read /dev/null for all I care) but in general gluing arbitrary fd
>> to its stdin might be desirable in other cases.
>
> $ ri Open3.pipeline_r Open3.pipeline_start
>
Again, like in Open3.pipeline the :err argument used in the example is
not documented.

From the description of the example it seems it captures the stderr of
all the commands together.

Are there more arguments like that?

What do they mean?

Also this is available in ruby 1.9 only.

Thanks

Michal