[Scilab-users] [Posible FRAUDE] Re: Odd behaviour with dos() function

[Federico Miyara]

I think I've finally arrived at a solution for multiple commands when 
using dos(). That is to use the "&&" command separator, which is 
mentioned in the cmnd.exe help.

I think even those of us who have made our first steps in the personal 
computing world in the DOS age aren't generally familiar with this 
separator because when we used DOS we just wrote our commands one after 
the other just pressing Enter between them. The && allows a sort of 
in-line batch.

This should be mentioned in the dos() documentation and a few more 
examples provided.

Regards,

Federico Miyara


On 28/07/2021 19:54, Federico Miyara wrote:
>
> I do the following:
>
> comands = "start | dir H:\ "
> dos(comands, "-echo")
>
> Then a command line DOS window opens at the workihg directory of 
> Scilab, and doesn't close.
>
> Any further action I attempt with Scilab causes a program crash. The 
> same happens without the pipe symbol |.
>
> Regards,
>
> Federico Miyara
>
>
>
> On 28/07/2021 10:57, Lester Anderson wrote:
>> Hello all,
>>
>> This has been queried previously without an obvious solution.
>>
>> For example: [output, bOK]=dos('grdinfo Test_10-FAA.grd')
>> Fails with bOK = F
>>
>> Adding 'start grdinfo Test_10-FAA.grd gives bOK=T but now dos window 
>> console with the result
>>
>> The only way to get the out put shown below is to put the commands 
>> into a bathch  file:
>> grd-info.bat (containing the command stream grdinfo Test_10-FAA.grd
>>
>> Such that the dos function becomes: [out,TF]=dos('start 
>> grd-info.bat'); out, TF
>>
>> \D_Drive\Geoscience\Scilab>grdinfo Test_10-FAA.grd
>> Test_10-FAA.grd: Title:
>> Test_10-FAA.grd: Command: grdsample -R-10/10/-10/10 -I1m 
>> @GMTAPI at -000001 -Gc:\Temp\Test_10-FAA.grd -fg --GMT_HISTORY=false
>> Test_10-FAA.grd: Remark:
>> Test_10-FAA.grd: Pixel node registration used [Geographic grid]
>> Test_10-FAA.grd: Grid file format: nf = GMT netCDF format (32-bit 
>> float), CF-1.7
>> Test_10-FAA.grd: x_min: -10 x_max: 10 x_inc: 0.0166666666667 (1 min) 
>> name: longitude n_columns: 1200
>> Test_10-FAA.grd: y_min: -10 y_max: 10 y_inc: 0.0166666666667 (1 min) 
>> name: latitude n_rows: 1200
>> Test_10-FAA.grd: v_min: -104.96169281 v_max: 456.651062012 name: z
>> Test_10-FAA.grd: scale_factor: 1 add_offset: 0
>> Test_10-FAA.grd: format: netCDF-4 chunk_size: 134,134 shuffle: on 
>> deflation_level: 3
>>
>> However, even with this workaround, nothing is written to the 
>> variable 'out'. The program 'grdinfo' is in the Windows path, so 
>> should be run without using start. In the past, the function did 
>> work. Basic Windows commands like {out, TF]=dos('dir') works.
>>
>> I have verified that nothing is written to the consolebox. In 
>> addition, this is a new computer and new install of Scilab 6.1.1
>> Also, the same function under Octave runs correctly as dos('grdinfo 
>> Test_10-FAA.grd'), and I am assuming the Scilab version should behave 
>> the same.
>>
>> Since the mailinglists section is no longer functional, I cannot 
>> check for possible solutions or pointers. Apologies if this is 
>> repeating my previous query on the issue.
>>
>> Thanks
>>
>> Lester
>>
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>
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