Transmission-Daemon: Update Blocklist

transmissionUpdateBlocklist.sh

#!/bin/bash

# blocklist directory
BLOCKLISTDIR=/var/lib/transmission-daemon/info/blocklists

cd ${BLOCKLISTDIR}
if [ $? -eq 0 ]; then
  if [ -f level1 ]; then
    rm level1
  fi
  # if no blocklist file exist update blocklist
  if [ ! -f level1 ]; then
    wget -q -O level1.gz http://update.transmissionbt.com/level1.gz
    # if download successful unzip it
    if [ -f level1.gz ]; then
          gunzip level1.gz
          # if file extracted successfully reload transmission
          if [ $? -eq 0 ]; then
            chmod go+r level1
            /etc/init.d/transmission-daemon reload
          else
                rm -f level1*
          fi
        fi
  fi
  cd - 2>&1 >/dev/null
fi

Transmission-Remote v1.90+ can also perform this via Cron:

@weekly /usr/bin/transmission-remote --blocklist-update

Reference: http://blog.shvetsov.com/2010/09/automatically-update-transmission-block.html

be sure to edit settings.json:

"blocklist-enabled": true