Re: [Help-bash] shebang for language that does not use # for comment

[Peng Yu]

On Tue, Jul 3, 2012 at 7:27 PM, Peng Yu <address@hidden> wrote:
> On Tue, Jul 3, 2012 at 7:14 PM, Peng Yu <address@hidden> wrote:
>>> and if you don't like putting the EOF at the end, you could use hacks like:
>>> ====
>>> #!/bin/bash
>>> shopt -s lastpipe; tail -n +2 "$0" | exec /usr/bin/env gp

OK. I see. You meant tail -n +3.

>>>
>>> \p 212
>>> (1.378-0.09143*I)^(14.87+0.3721*I)
>>> ====
>
> This seems not working. Is there anything wrong?
>
> ~/linux/test/gnu/bash/man/builtin/shopt/lastpipe$  ./main1.sh
>                   GP/PARI CALCULATOR Version 2.5.1 (released)
>           i386 running darwin (x86-64/GMP-5.0.4 kernel) 64-bit version
>         compiled: Jul  3 2012, gcc-4.2.1 (Apple Inc. build 5666) (dot 3)
>                 (readline v6.2 disabled, extended help enabled)
>
>                      Copyright (C) 2000-2011 The PARI Group
>
> PARI/GP is free software, covered by the GNU General Public License, and comes
> WITHOUT ANY WARRANTY WHATSOEVER.
>
> Type ? for help, \q to quit.
> Type ?12 for how to get moral (and possibly technical) support.
>
> parisize = 8000000, primelimit = 500509
>   ***   unused characters: shopt-slastpipe;tail-n+2"$0"|exec/usr/bin/en
>   ***                                              ^--------------------
>    realprecision = 231 significant digits (212 digits displayed)
> %1 = 
> 80.817082637557070449383034933010288336925078193546211741027496566803185110925792657439929206283145167399627244460426678862453227164569661204139651873272488827365261487845201056199035423784093096984005713791800191
> - 
> 94.838461889186304973351271821601500916571303364865064205039706592481303045713982306764332644305117525157057688587100513820353771954974829340172391797575388246887990680136241031895212412150770309289450962931402933*I
> Goodbye!
> ~/linux/test/gnu/bash/man/builtin/shopt/lastpipe$ cat main1.sh
> #!/usr/bin/env bash
> shopt -s lastpipe; tail -n +2 "$0" | exec /usr/bin/env gp
>
> \p 212
> (1.378-0.09143*I)^(14.87+0.3721*I)
>
>
>
>
>> I never knew lastpipe this before. But I'm having difficulty in
>> understanding the following description. Could anybody elaborate it a
>> bit? In the context of the above example, how it works?
>>
>>               lastpipe
>>                       If set, and job control is not active, the shell
>> runs the last command of a pipeline not executed in the background in
>> the current shell environment.
>>
>> BTW, how "job control" can be nonactive?
>>
>> --
>> Regards,
>> Peng
>
>
>
> --
> Regards,
> Peng



-- 
Regards,
Peng