4chan grabber script

#!/bin/sh

if [ "$1" = "" ]; then
        echo "Usage: `basename $0` <4chan thread url>"
        exit 1
fi

echo "4chan downloader"
echo "Downloading until canceled or 404'd"
LOC=$( echo "$1" | egrep -o '([0-9]*)$' | sed 's/\.html//g' )
echo "Downloading to $LOC"

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

cd $LOC

while [ true ]; do
        TMP=`mktemp /tmp/4chan.XXXXXX`
        TMP2=`mktemp /tmp/4chanm.XXXXXX`
        WGET_CMD='wget -nv -nc'

        wget -O "$TMP" "$1"
        if [ "$?" != "0" ]; then
                rm $TMP $TMP2
                exit 1
        fi

        egrep 'http://images.4chan.org/[a-z0-9]+/src/([0-9]*).(jpg|png|gif)' "$TMP" -o | uniq > "$TMP2"
        #cat "$TMP2" | sed 's!/cb-nws!!g' > "$TMP"

        #wget -nc -i $TMP2

        cat $TMP2 | xargs -P 5 -I _URL_ $WGET_CMD _URL_

        rm $TMP $TMP2

        echo "Waiting 30 seconds befor next run"
        sleep 30
done;