Script to remove torrents from transmisison when done. Based on https://community.wd.com/t/guide-auto-removal-of-downloads-from-transmission-2-82/93156

transmission-purge-completed.sh

#!/bin/sh

# the folder to move completed downloads to

# port, username, password
SERVER="9091 --auth user:password"

# use transmission-remote to get torrent list from transmission-remote list
# use sed to delete first / last line of output, and remove leading spaces
# use cut to get first field from each line
TORRENTLIST=`transmission-remote $SERVER --list | sed -e '1d;$d;s/^ *//' | cut --only-delimited --delimiter=" " --fields=1 | sed 's/\([0-9]*\).*/\1/'`

transmission-remote $SERVER --list

# for each torrent in the list
for TORRENTID in $TORRENTLIST
do
    echo Processing : $TORRENTID

    # check if torrent download is completed
    DL_COMPLETED=`transmission-remote $SERVER --torrent $TORRENTID --info | grep "Percent Done: 100%"`
#    echo $DL_COMPLETED

    # check torrents current state is
    STATE_STOPPED=`transmission-remote $SERVER --torrent $TORRENTID --info | grep "State: Seeding\|Stopped\|Finished\|Idle"`
#    echo $STATE_STOPPED

    # if the torrent is "Stopped", "Finished", or "Idle after downloading 100%"
    if [ ! -z "$DL_COMPLETED" ] && [ ! -z "$STATE_STOPPED" ]; then
        # move the files and remove the torrent from Transmission
        echo "Torrent #$TORRENTID is completed"
        echo "Removing torrent from list"
        transmission-remote $SERVER --torrent $TORRENTID --remove
    else
        echo "Torrent #$TORRENTID is not completed. Ignoring."
    fi
done