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choose your style
> /var/lib/docker/containers/*/*-json.log
cat /dev/null > /var/lib/docker/containers/*/*-json.log
echo "" > /var/lib/docker/containers/*/*-json.log
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sudo sh -c "truncate -s 0 /var/lib/docker/containers/*/*-json.log"
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echo "" > $(docker inspect --format='{{.LogPath}}' <container_name_or_id>)