From: Joel VanderWerf <vjoel@...>
Date: 2005-06-24T03:59:38+09:00
Subject: Re: Shell type

Panich, Alexander wrote:
> Under Linux, by default, method Kernel.system(command) (backticks as
> well) executes command in the subshell of SH type.

Is this really true?

irb(main):019:0> puts `pstree -a #{$$}`
irb ...
   └─pstree -a 8921
=> nil
irb(main):020:0> Thread.new {system "/usr/local/bin/ruby", "-e", "puts 
%{foo}; sleep 10"}
=> #<Thread:0xb7d64988 sleep>
irb(main):021:0> foo

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?