Автоматизация загрузки торрентов

#!/bin/sh

TORRENTS_DIR="/home/zver/torrents"
RUN_FILE="${TORRENTS_DIR}/running.txt"
LOG_FILE="${TORRENTS_DIR}/ctorrent.log"
DOWNLOADED_DIR="${TORRENTS_DIR}/downloaded"
SAVE_DIR="/home/user"
CTORRENT="/usr/local/bin/ctorrent"

if [ ! -x "${CTORRENT}" ]; then
 echo "ctorrent binary not found"
 exit 1
fi

if [ ! -d "${DOWNLOADED_DIR}" ]; then
 mkdir -p "$DOWNLOADED_DIR"
fi

for trfile in `ls "${TORRENTS_DIR}" | grep -E '\.torrent$'`; do
 if [ -f "${RUN_FILE}" ]; then
   if [ ! -z "`cat "${RUN_FILE}" | grep -F "${trfile}"`" ]; then
     ctorrent_run=`ps -ax | grep ctorrent`
     if [ -z "${ctorrent_run}" ]; then
       rm -f "$RUN_FILE" "$LOG_FILE"
       mv "${TORRENTS_DIR}/${trfile}" "${DOWNLOADED_DIR}"
       continue
     else
       break
     fi
   else
     continue
   fi
 else
   ${CTORRENT} -a -e 0 -C 32 -U 32 "${TORRENTS_DIR}/${trfile}" > ${LOG_FILE} 2>&1 &
   echo "${trfile}" > "${RUN_FILE}"
   break
 fi
done

exit 0