Re: script relative shebang

From: Boris
Date: Wed Jun 01 2016 - 04:05:03 EST

Hi Nicolai,

Yes, I think this is too ugly:

#!/usr/bin/gawk {exit system("/bin/sh -c 'exec \"$(dirname \"$0\")\"/subdir/catself \"$0\"' " FILENAME);}

Imagine you have that feature in your kernel would you rather use:


You second advice involves changing root fs which is not desirable in copy-deployment apps (bring all the dependencies)

This more about making kernel "user" friendly.

Thank you.

On 1 June 2016 00:02:05 BST, Nicolai Stange <nicstange@xxxxxxxxx> wrote:
>Hi Boris,
>Boris Rybalkin <ribalkin@xxxxxxxxx> writes:
>> I would like to know if any changes to parsing '#!' script header
>> are accepted in particular having ability to run interpreter from
>> relative to the script path?
>> Something like:
>> #!{dirname}/python/bin/python
>> Where {dirname} is a special keyword replaced with dirname of a
>Just for the record, this can already be done without any help from the
>Assuming the following demonstration directory layout
> <some_test_dir>/subdir/catself
> <some_test_dir>/relshebang
>where is your "interpreter":
> #!/bin/sh
> tail -n +2 $1
>and relshebang is your script file invoking the toy interpreter from
>shebang as follows:
>#!/usr/bin/gawk {exit system("/bin/sh -c 'exec \"$(dirname
>\"$0\")\"/subdir/catself \"$0\"' " FILENAME);}
> Hello world.
>You don't necessarily need to use gawk here, anything being able to do
>system() and taking some code snippet from its first argument will
>certainly work.
>If this is too ugly, you could also write your own wrapper a la
>/usr/bin/env and install that at some central location.

Sent from my Android device with K-9 Mail. Please excuse my brevity.