ws2801 pixel led control RaspberryPi

#!/bin/bash
# programado por Juanmol para http://rsppi.blogspot.com
RESPONSE=/tmp/webresp
log=/var/log/pixel-access.log
status=/tmp/estados.led
leds2=/tmp/leds2.sh
temp=/tmp/estados.led.tmp
num_leds=50
max=ff

[ -p $RESPONSE ] || mkfifo $RESPONSE

while true ;
do
        ( cat $RESPONSE ) | nc -l -p 8080 | (
        REQUEST=`while read L && [ " " "<" "$L" ] ; do echo "$L" ; done`
        REQ="`echo \"$REQUEST\" | head -n 1`"
        pixel=$(echo $REQ | cut -f3 -d\/ | cut -f1 -d\ )

        if [ "$(cat $status | grep ^$pixel\ | wc -l)" -eq "1" ] || [ $pixel = reset ];
        then

                echo "[ `date '+%Y-%m-%d %H:%M:%S'` ] $REQ" >>$log
                if [[ $REQ =~ ^GET\ /pixel[\ \/\#?] ]]; then
                        estado=$(echo $REQ | cut -f4 -d\/ | cut -f1 -d\ )
                        case $estado in
                        1 )
                                color="\\\\x$max\\\\x00\\\\x00"
                        ;;
                        2 )
                                color="\\\\x00\\\\x$max\\\\x00"
                        ;;
                        3 )
                                color="\\\\x00\\\\x00\\\\x$max"
                        ;;
                        4 )
                                color="\\\\x$max\\\\x$max\\\\x00"
                        ;;
                        5 )
                                color="\\\\x$max\\\\x00\\\\x$max"
                        ;;
                        6 )
                                color="\\\\x00\\\\x$max\\\\x$max"
                        ;;
                        7 )
                                color="\\\\x$max\\\\x$max\\\\x$max"
                        ;;
                        * )
                                color="\\\\x00\\\\x00\\\\x00"
                        ;;
                        esac
                        cat $status | sed "s/^"$pixel"\ .*/"$pixel"\ "$color"/g" > $temp
                        cp $temp $status
                fi
                if [ $(echo $pixel) = reset ];
                then
                        rm $status;
                        for n in $(seq 1 $[$num_leds+1]);
                        do
                                echo $n\ \\\\x00\\\\x00\\\\x00 >> $status;
                        done
                fi
                cat $status | awk '{ print $2 }' | sed 's/^\\/echo\ \-ne\ \"\\/g' | tr "\n" "\"" | sed 's/\"e/\"\ \> \/dev\/spidev0\.0\ \&\&\ e/g' | sed 's/\"\"/\"\ \> \/dev\/spidev0\.0/g' > $leds2;
                /bin/bash $leds2;
        fi
        cat >$RESPONSE <<EOF
HTTP/1.0 200 OK
Cache-Control: no-cache
Content-Type: text/html
Server: bash/2.0
Connection: Close
Content-Length: 0

EOF
    )
done