Is there any way to disable the thumbnail feature in Gwenview? I don't mean to delete them on exit, I mean to use Gwenview without creating the thumbnails in the first place.

No, this is not possible.

agateau wrote:No, this is not possible.

Thanks agaateau, I appreciate the info.

For those in the future like myself who may be looking for a solution to this:

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rm -rf $HOME/.cache/thumbnails
mkdir -p /dev/shm/thumbnails
ln -s /dev/shm/thumbnails .thumbnails

...this puts all the thumbnails into ramdisk, which disappears at shutdown or reboot.

Further management of thumbnails is left as an exercise for the user. For example, I do this in my scripts:

At the top:

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RAMDISK=/dev/shm
# Note that the -f option on rm eliminates most error reporting, so if you make a mistake or misunderstand what you have, you may not remove anything.
trap 'echo cleaning up; cd $RAMDISK; rm -rf whatever; find ~/.cache/thumbnails/* -type f -exec rm -f {} \; ; rm -rf $RAMDISK' EXIT

mkdir -p $RAMDISK/.thumbnails