Re: singleton for script with shebang

[Bradley Asztalos]

Ole,

Taking this one step further, I know of course there are other ways to do this, but what about a way to have sem die if it cannot immediately acquire execute? Something like --die_young so that it could be used not only to serialize but to disallow a run if there is already a process running with the same lock_id.

#!/usr/bin/parallel --shebang-wrap --semaphore --fg -u --id lock_id --die_young /bin/bash 
echo "enter"$
exec sleep 5
echo "exit"$

Thanks again for your great work!

Cheers, Bradley

On Fri, Jan 2, 2015 at 1:44 AM, Bradley Asztalos <brad@customweather.com> wrote:

Ole,

Thank you for the great product. It's a joy to use and thank you for administering the forum so well.

Cheers, 

Bradley Asztalos

On Fri, Jan 2, 2015 at 1:29 AM, Bradley <brad@customweather.com> wrote:

Agreed "Doh!"

> On Jan 2, 27 Heisei, at 12:48 AM, Ole Tange <ole@tange.dk> wrote:
>
> On Thu, Jan 1, 2015 at 10:54 PM, Bradley Asztalos
> <brad@customweather.com> wrote:
>
>> But I'm wondering if it is possible to use shebang in this context as in:
>
> It is.
>
>> -------singleton.sh---------
>>
>> #!/opt/local/bin/parallel --shebang-wrap /bin/bash --semaphore --fg -u --id
>> lock_id
>> echo "start" $$
>> sleep 10
>> echo "end" $$
>>
>> ---------
>>
>> This does not work. Any ideas here?
>
> You are going to say 'Doh'.
>
> /bin/bash is not an argument for --shebang-wrap. It is the command you
> want to be run. Also --semaphore --fg -u --id are not options for
> bash. Swap them around and you are good:
>
> #!/opt/local/bin/parallel --shebang-wrap --semaphore --fg -u --id
> lock_id /bin/bash
>
> (Here is where you say 'Doh').
>
>
> /Ole