From: Brian Candler <b.candler@...>
Date: 2011-03-02T21:56:39+09:00
Subject: Re: exec using sh -c or directly running the command, depending on the system

Looks like there was a change in Ruby, where perhaps it now does an 
optimisation to check for cases where a shell isn't required (e.g. no 
pipelines or redirection)

You could make it consistent by using the multi-argument form of exec, 
which I believe will bypass the shell in all cases:

> --------------------------->8--------------------------------------
> # runned.rb
> puts Process.pid
> puts Process.ppid
>
> # runner.rb
> def runProcess(cmd)

def runProcess(*cmd)

>   pid = nil
>
>   begin
>     pid = fork do
>       exec(cmd)

exec(*cmd)

>       exit 1
>     end
>   rescue Errno::ENOENT
>     $stderr.puts e
>   end
>   return pid
> end
>
> runProcess('ruby "runned.rb"', true)

runProcess('/usr/bin/ruby', 'runned.rb')

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