Re: Unable to define shebang for guix shell file

[Carlo Zancanaro]

Hey Jacob,

On Tue, Nov 09 2021, Jacob Hrbek wrote:
> > For now I use “#!/usr/bin/env -S guix shell --”, which works 
> > well enough for me.  How does that sound? -- ludo@gnu.org
>
> Not a solution as (AFIAK) POSIX only accepts one argument.

That's the point of the -S. It passes the entire rest of the line 
as a single argument to /usr/bin/env, which reads it as a single 
-S argument which /usr/bin/env then interprets as a command with 
arguments.

Something like how this doesn't work:

 $ /usr/bin/env 'echo hello'
 /usr/bin/env: ‘echo hello’: No such file or directory
 /usr/bin/env: use -[v]S to pass options in shebang lines

But this does:

 $ /usr/bin/env '-S echo hello'
 hello

It looks like this was added to coreutils in 2018 in version 8.30. 
I wasn't aware of this feature until seeing Ludo's email, but it 
seems like a neat solution to the problem.

Carlo