root/10kz/shell/url-decode.sh

#!/bin/sh 

# test urls:
s="foo.com?paramone=valueone+value1.1"
s="foo.com?paramone=valueone+value1.1&p2=val%20thingy%20more%20more%2Fmore"
s="feedmelinks.com/login?bounceToPage=%2Fcategorize%3F%26loggedIn%3Dwasnt%26from%3Dtoolbar%26op%3Dsubmit%26name%3DFlickr%253A%2520Photos%2520tagged%2520with%2520jm3%26url%3Dhttp%253A%2F%2Fwww.flickr.com%2Fphotos%2Ftags%2Fjm3%2Finteresting%2F%26ref%3Dhttp%253A%2F%2Fwww.flickr.com%2Fphotos%2Ftags%2Fjm3%2F%26version%3D0.7"
s="google.com/accounts/ServiceLogin?service=mail&passive=true&rm=false&continue=http%3A%2F%2Fmail.google.com%2Fmail%2F%3Fui%3Dhtml%26zy%3Dl&ltmpl=wsad&ltmplcache=2"

qs=$1
is_qs=`echo "$qs" | grep "\?" > /dev/null`
if [ $? -ne 0 ]
then
        echo no ? found in qs\; bailing
        exit 1
fi

s=$qs

params=`echo $s | sed "s/^.*\?//" | sed "s/&/ /g"`
for p in $params
do
        echo $p
        tokens=`echo $p | sed "s/\+/__SPACE__/g" | sed "s/%\([0-9A-F][0-9A-F]\)/ HEX:\1 /g"`

        for t in $tokens
        do
                echo $t | grep -q HEX:
                if [ $? = 0 ]
                then
                        t=`echo $t | sed s/HEX://`
                        echo `printf "%d" 0x$t` | awk '{printf("%c", $1)}'
                else
                        echo -n `echo $t | sed "s/__SPACE__/ /g"`
                fi
                done
                echo
                echo

done

exit 0