From: Lloyd Zusman <ljz@...>
Date: 2001-03-31T14:40:04+09:00
Subject: [ruby-talk:13377] Re: Passing an array to `exec'?

OOPS ... a couple of corrections (marked with "###", below):

Lloyd Zusman <ljz@asfast.com> writes:

> I'd like to do the following:
> 
>     cmd = [ '/bin/ls', ARGV ]
###   cmd = [ '/bin/ls' ].concat( ARGV )
>     exec(cmd)
> 
> However, this doesn't work, because the `exec' method cannot take an
> array as an argument.
> 
> I know that the following is possible:
> 
>     cmd = [ '/bin/ls', ARGV ]
###   cmd = [ '/bin/ls' ].concat( ARGV )
>     exec(cmd.join(' '))
> 
> However, this causes the command line passed to `exec' to be fed
> to the shell, which I do not want.
> 
> Is there any way to make ruby construct a proper argument list for a
> method from an array?
>   
> Thanks in advance.

I also know that I can do this:

    cmd = [ '/bin/ls' ].concat( ARGV )
    eval 'exec("' + cmd.join('", "') + '")'

But is this the only way that I can get the behavior I want?  It's
rather inelegant, and seems inefficient.

-- 
 Lloyd Zusman
 ljz@asfast.com