A Radarr post processing script to change the rTorrent label after import.

radarr_label_change.sh

#!/bin/bash

# This script uses the xmlrpc command from the xmlrpc-c package to change the label of an imported torrent in rTorrent.

# First argument is host
host="${1:-localhost}"

# Second argument is port
port="${2:-9082}"

# Third argument is new label
new_label="${3:-seed}"

# Identifiable portion of path to torrents, so it will only run on torrents.
# For example, a path of "/data/torrents/movies", "torrents" is a good choice.
torrent_path_portion="torrents"

# Check that the movie is a torrent.
if ! [[ "${radarr_moviefile_sourcepath}" =~ ${torrent_path_portion} ]]; then
  echo "[Torrent Label] Path ${radarr_moviefile_sourcepath} does not contain \"torrent\", exiting."
  exit
fi

if ! [[ -x $( command -v xmlrpc ) ]]; then
  echo "[Torrent Label] No xmlrpc binary found."
  exit
fi

if [[ -n ${radarr_download_id} ]]; then
  if xmlrpc "${host}":"${port}" d.custom1.set "${radarr_download_id}" "${new_label}" > /dev/null 2>&1; then
    echo "[Torrent Label] Label for torrent ${radarr_release_title} with hash ${radarr_download_id} changed to ${new_label}"
  else
    echo "[Torrent Label] Label for torrent ${radarr_release_title} with hash ${radarr_download_id} NOT CHANGED."
    exit
  fi
fi

Master! I have a question to ask you, I wrote a script to use tinyMediaManager to grab movie data after radarr downloads and imports movies. The script content is:
!#/bin/bash
/volume1/tmm/tinyMediaManager -u -n
The script passed the radarr test, but the script was triggered by grabbing, downloading, and importing movies through radarr, but the tinyMediaManager has never been run. However, if the script is manually executed on the SSH terminal, tinyMediaManager can run normally to grab movie data. The official wiki of radarr mentions that there are environment variables, but it does not mention how to use them. Seeking help from radarr staff on Discord has not been resolved, saying that the script needs to be written by myself, I said I can't, they said let me search with google, but I have not found a way to write custom scripts about radarr.
I saw your script today, there are environment variables, but I don't know how to write them. Can you help me write a script like this?