[Qgis-user] QGIS Modeler: Automatic Deletion/Overwriting of output files (precalculated value)?

[celati Laurent]

Hello,
Thanks so much for your reply. I have just done several tests following
your recommandation. Indeed,  *"Enable overwrite:* Processing -> Options ->
General -> *Overwrite existing files" *seems to work and to be enough for
my use case.

Le lun. 12 janv. 2026 à 20:32, vukovicvl at fiberq.net vukovicvl at fiberq.net <
vukovicvl at fiberq.net> a écrit :

> Hi celati,
>
> QGIS Modeler doesn’t really have a built-in “clean intermediate outputs on
> rerun” option. The usual workarounds are:
>
> *Enable overwrite:* Processing -> Options -> General -> *Overwrite
> existing files*. For many GDAL outputs (like GeoTIFF) this is enough.
>
> *Delete first, then run:* Add a first step in the model that deletes the
> known intermediate files (if you have a delete/remove tool available in
> your Processing toolbox - often under GDAL). Since your filenames are
> fixed, it’s straightforward.
>
> If you don’t have any delete tool available in Modeler, the reliable
> fallback is running the model from a small script that deletes the
> *intermediate* folder contents before launching the model.
>
> I hope this helps.
>
>
> On 01/12/2026 7:05 PM CET celati Laurent via QGIS-User <
> qgis-user at lists.osgeo.org> wrote:
>
>
>
>
> Dear all,
>
>
>
> I'm working with QGIS 3.40.
>
> I've set up a small QGIS modeler with several inputs, algorithms,
> intermediate outputs, and a final result (model output). For the
> intermediate algorithm outputs, I've defined a "pre-calculated value" with
> a relative path.
>
> Here 's the expression setted :
>
> @project_home || '/intermediaire' || '/segmentation_raster' || '.tif'
>
>
>
> All my intermediate outputs are stored in a folder named "intermediate".
> Each output file has a predefined name and extension.
>
> This works. However, I would like these 'intermediate' files to be
> automatically deleted/overwritten each time the modeler is run again
> (delete/replace the output files from the previous run).
> Could you give me some guidances, provide some ways to do that ? Thanks so
> much.
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>
> [image: FiberQ]
> Vladimir Vuković
> Author of FiberQ
>
> vukovicvl at fiberq.net
> fiberq.net
> +381 60 426 2012 <+381604262012>
>
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