From: Michal Suchanek <hramrach@...>
Date: 2006-08-09T08:15:22+09:00
Subject: Re: How to auto-locate interpreter image

On 8/2/06, Scheming Commie <ired@timecube.com> wrote:
> On Sat, 15 Jul 2006 21:06:25 +0000, Just Another Victim of the Ambient
> Morality wrote:
> >     I'm pretty sure the "#!" line is meaningless on Windows and the shell
> > doesn't even bother looking for it.  Indeed, it always struck me a little
> > weird that every script knows exactly where the interpreter image is.  What
> > if it were to move?  All your scripts will suddenly break!  An annoying,
> > albeit, unlikely scenario...
>
> #!/usr/bin/env perl
> #!/usr/bin/env ruby
> .. etc
>
> env finds the interpreter wherever it is and runs it, as you'd expect.
>
> A neat trick, I don't know why it isn't used, well, universally.
>
> Of course it relies on env being in /usr/bin but, that changes less
> (never) than where particular interpreters are.

however, on some platforms /usr/bin/env is broken. Not to mention the
occasions when there are several interpreters installed.

Thanks

Michal