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fpath='/etc/jupyter/jupyter_notebook_config.json' jpath='.NotebookApp.nbserver_extensions.jupyter_nbextensions_configurator' if [[ -f "$fpath" ]]; then content=$(cat "$fpath") else content='{}' fi post_install() { echo "$content" | jq "$jpath = true" >"$fpath" } post_upgrade() { post_install } pre_remove() { echo "$content" | jq "del($jpath)" >"$fpath" }