Extract scene releases bash script

#!/bin/bash
#
# Author: Jose Luis Salas
# License: GPL v3
#
# Extract releases from scene releases with a SFV and the RAR files
#

#set -x -v

TIMER=10

LOG_DIR=~/.lpar
LOG_CKSFV=$LOG_DIR/cksfv.log
LOG_RAR=$LOG_DIR/rar.log
LOG_EXTRAIDOS=$LOG_DIR/extracted.log

CKSFV=`which cksfv`;
RAR=`which rar`;

if [ ! $CKSFV -o ! $RAR ]; then
        echo "rar and cksfv is needed to run !!!";
fi

function parse_sfv {
        echo "** Found $1"
        DIR=$(dirname "$1")
        BASE=$(basename "$1")

        pushd "$DIR" > /dev/null
        echo -n " * Checking SFV ...";
        $CKSFV -q -f "$BASE" 2>> $LOG_CKSFV

        if [ $? = 0 ]; then
                echo -e " : \033[0;32mOK\033[0m";
                if [ -f ${BASE%%sfv}rar ];then
                        FILE_TO_EXTRACT=${BASE%%sfv}rar
                else
                        FILE_TO_EXTRACT=$(head -n 1 $BASE | cut -d ' ' -f 1 | grep '\.rar')
                fi

                echo -n " * Extracting $FILE_TO_EXTRACT ...";
                $RAR x -o+ $FILE_TO_EXTRACT >> $LOG_RAR 2>&1

                if [ $? = 0 ]; then
                        echo -e " : \033[0;32mOK\033[0m";

                        if [ $DISPLAY ]; then
                                DIALOG=`which kdialog`;
                                if [ $DIALOG ]; then
                                        $DIALOG --passivepopup "Extraido ${BASE%%.sfv}" 10 &
                                fi
                        fi

                        echo "- Extracted ${BASE%%sfv}" >> $LOG_EXTRAIDOS
                        echo "- Deleted $(awk -F " " '{print $1}' $BASE)" >> $LOG_EXTRAIDOS
                        echo "- Deleted $BASE" >> $LOG_EXTRAIDOS
                        rm -f $(awk -F " " '{print $1}' $BASE)
                        rm -f $BASE
                else
                        echo -e " : \033[0;31mFAIL\033[0m"
                fi
        else
                echo -e " : \033[0;31mFAIL\033[0m"
        fi

        popd > /dev/null
}

if [ ! -d $LOG_DIR ]; then
        mkdir $LOG_DIR
fi

if [ $# -eq 1 ]; then
        RUTA="$1";
else
        RUTA="$PWD";
fi

while true; do
        for i in `find $RUTA -iname "*.sfv"`; do
                parse_sfv "${i}"
        done

        echo "Sleeping ...";
        sleep ${TIMER}m
done