From: nobu@...
Date: 2006-08-01T22:46:42+09:00
Subject: Re: Default shell for Kernel::system() ?

Hi,

At Tue, 1 Aug 2006 17:20:25 +0900,
Ronald Fischer wrote in [ruby-talk:205370]:
> Ist it possible to kind of define a default shell which will be used
> for Kernel::system? I often need to invoke from my Ruby scripts

/bin/sh is hardcoded, like as make, cron and so on.

> external commands, involving redirection and globbing, for example
> (bash syntax)
> 
>     foo [a-z]* 2>&-

Closing descriptor should work on all variants of Bourne shell,
including UNIX Seventh Edition's.

http://www.freebsd.org/cgi/man.cgi?query=sh&apropos=0&sektion=0&manpath=Unix+Seventh+Edition&format=html

       Input output.

       <&-    The standard input is closed.  Similarly for the standard output
	      using >.

       If one of the above is preceded by a digit  then  the  file  descriptor
       created is that specified by the digit (instead of the default 0 or 1).
       For example,

	    ... 2>&1

       creates file descriptor 2 to be a duplicate of file descriptor 1.


>     bar <<<baz

In Ruby, you can:

  IO.popen("bar", "w") {|f| f.puts "baz"}

>     def bash(cmd)
        system("bash", "--norc", "-c", cmd)
>     end

-- 
Nobu Nakada