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Re: [gforth] scripting

From: Joel Rees
Subject: Re: [gforth] scripting
Date: Fri, 25 Dec 2015 12:45:30 +0900

2015/12/23 23:20 "Mark J. Reed" <address@hidden>:
> You can also use the `env` program to make a script that doesn't rely on the 
> specific location of gforth in the file system:
>  #!/usr/bin/env gforth

Just a reminder that convenience and security are often at odds with each other.

You generally want to consider the odds that someone might be able to
slip a compromised gforth into your path ahead of the real one before
you take the path out of the shebang line.

> That uses up your one extra argument, so you lose the ability to pass 
> additional flags on the command line, but it makes your script more portable 
> (on my system, for instance, gforth is in /usr/local/bin, so a 
> #!/usr/bin/gforth line won't work).

(And that's basically the real reason for that bothersome make install
step, when making generalized tools. :)

> On Wed, Dec 23, 2015 at 6:20 AM, Anton Ertl <address@hidden> wrote:
>> On Tue, Dec 22, 2015 at 07:50:49PM -0500, James Gere wrote:
>> > I think I read somewhere that some shells/implementations require a comment
>> > character in the shebang.  Gforth Manual I'm certain.
>> "#!" starts a comment (until the end of the line) in Gforth, and
>> that's there in order to allow Gforth scripts.  This means that you
>> have to put a space after #! (allegedly there is at least one Unix
>> variant that checks for "#! /", so the space is a good idea anyway).
>> For a .fs script, no additional flags are necessary.  If you call
>> bla.fs arg1 arg2
>> and bla.fs starts with
>> #! /usr/bin/gforth
>> this is equivalent
>> /usr/bin/gforth bla.fs arg1 arg2
>> which is probably what you want.  You can put *one* additional
>> argument (e.g., a flag) on the #! line; e.g., if you have the
>> following in bla.fs:
>> #! /usr/bin/gforth --die-on-signal
>> then the call abive is equivalent to
>> /usr/bin/gforth --die-on-signal bla.fs arg1 arg2
>> - anton
> --
> Mark J. Reed <address@hidden>

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