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I hacked it all together but cookies to anyone that can improve it

#!/bin/sh

cd /home/king3/Pictures/webcomics/XKCD/

i=1;
while [ $i -lt 5 ]
do
	fileexist=`find . -name ""$i"_\[*"` #looks for files starting with"2_[" if your on i = 2
	echo ${#$(find . -name ""$i"_\[*")}
	if [ ${#fileexist} -eq 0 ]
	then
        	wget http://xkcd.com/$i/
		url=$(grep http://imgs.xkcd.com/comics/ index.html | head -1 | cut -d\" -f2)	
		file=$(echo $url | cut -d\" -f2 | cut -d\/ -f5)
		alttext=$(grep http://imgs.xkcd.com/comics/ index.html | head -1 | cut -d\" -f6)	
		name=${file%_(1).jpg}
		name=${name%.jpg}.jpg
		wget $url
		mv $file "$i"_"[""$alttext""]"_$name
		rm index.html
	else
		echo already have number $i
	fi;
	i=`expr $i + 1`
done