radarr-delete-unmonitored.sh

#!/bin/sh

# See: https://github.com/Radarr/Radarr/wiki/Mass-Delete-via-API

HOST=http://radarr.local:7878
API_KEY= # Settings > General

ids=$(curl --silent $HOST/api/movie -X GET -H "X-Api-Key: $API_KEY" \
  | jq '.[] | select(.monitored == false) | .id')

for id in $ids; do
  echo "Deleting movie id $id"
  curl --silent $HOST/api/movie/$id -X DELETE -H "X-Api-Key: $API_KEY"
done

For this to work with Radarr 3.0.0 you will need to add /v3 to both API paths as per API docs.

API path should be /api/v3/movie/{id}