From: Pete Elmore <pete@...>
Date: 2005-06-24T04:25:42+09:00
Subject: Re: Shell type

Joel VanderWerf wrote:
> Panich, Alexander wrote:
>> Under Linux, by default, method Kernel.system(command) (backticks as
>> well) executes command in the subshell of SH type.
> irb(main):022:0* puts `pstree -a #{$$}`
> irb ...
>   ├─pstree -a 8921
>   └─ruby -e puts\040%{foo};\040sleep\04010
> => nil
> 
> This is linux, too. I don't see any sh invocation. It's not hidden by 
> pstree is it?
I think the reason you don't see the shell is that it is exec()d, 
otherwise this wouldn't work:
irb(main):082:0> `env | grep ^USER | sed s/$USER/me/`
=> "USER=me\n"