Re: [Patch] Using 'perl' in *.sh

From: Jan-Benedict Glaw <jbglaw@lug-owl.de>
Date: Jul 9, 2006, 16:24 UTC
Message-ID: <20060709162407.GV22573@lug-owl.de>
In-Reply-To: <86ejwuuba2.fsf@blue.stonehenge.com>

On Sun, 2006-07-09 07:02:13 -0700, Randal L. Schwartz <merlyn@stonehenge.com> wrote:

Show 14 quoted lines

> >>>>> "Michal" == Michal Rokos <michal.rokos@nextsoft.cz> writes:
> 
> Michal> I have no problem with that. I can set $PATH.
> Michal> But then I'd suggest to change magic #!
> Michal> from #!/usr/bin/perl
> Michal> to #!/usr/bin/env perl
> Michal> for *.perl
> 
> Michal> It that what you meant?
> 
> No, don't do that.  Use the path to Perl that they chose during
> configuration because
> 
> (a) it might not be the first one in PATH

If you want to execute some binary that's not first in path, you'd better *always* call that explicit.

> (b) even if it's the first one in *my* path, it might not be the
>     first one in *everyone's* path

Communication problem. Machine's administrator should offer a working git installation. If a user chooses to build his own git, he'd better make sure that all the environment is properly set-up, too.

> (c) env requires an *extra* fork/exec

Only an extra exec.

> (d) some systems don't have env

Huh? Show me a system that has no /usr/bin/env, but a working POSIX shell in /bin/sh .

> The env hack is a nice hack, but it's just a hack.  Don't
> rely on it when the right thing is nearby.

What's the right thing? The right thing is to explicitely call the interpreter, not using the shellbang at all.

MfG, JBG

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