Re: singleton for script with shebang

[Bradley]

Thanks for the reply,  see ole's clever response....



> On Jan 1, 27 Heisei, at 11:14 PM, Shlomi Fish <shlomif@shlomifish.org> wrote:
> 
> Hi Bradley,
> 
> On Thu, 1 Jan 2015 13:54:57 -0800
> Bradley Asztalos <brad@customweather.com> wrote:
> 
>> I have a simple script, foo.sh::
>> 
>> #!/bin/bash
>> echo "start" $$
>> sleep 10
>> echo "end" $$
>> 
>> I can run make sure this runs as a singleton with
>> 
>> sem --fg -u --id lock_id ./foo.sh
>> 
>> But I'm wondering if it is possible to use shebang in this context as in:
>> 
>> -------singleton.sh---------
>> 
>> #!/opt/local/bin/parallel --shebang-wrap /bin/bash --semaphore --fg -u --id
>> lock_id
>> echo "start" $$
>> sleep 10
>> echo "end" $$
>> 
>> ---------
> 
> parallel is written in Perl 5 and uses «#!/usr/bin/perl» or whatever as a
> shebang. As a result it cannot be itself used as a she-bang processor.
> Furthermore, I should note that in programming, it is a good idea to stick to
> the https://en.wikipedia.org/wiki/KISS_principle and not try to be as clever 
> as
> possible.
> 
> Hope it helps.
> 
> Regards,
> 
>    Shlomi Fish
> 
>> This does not work. Any ideas here?
>> 
>> Bradley
> 
> 
> 
> -- 
> -----------------------------------------------------------------
> Shlomi Fish       http://www.shlomifish.org/
> The Human Hacking Field Guide - http://shlom.in/hhfg
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