unzip file to its own directory

#! /bin/bash
#this could be cleaner, but it makes a new dir, CD's into it, and unzips the zip file in there.
#useful when people release windows programs.
#wyatt ward 2014
#USUAL "WITHOUT ANY WARRANTY IMPLIED OR OTHERWISE" THING HERE
export INFILENAME=`echo "$@" | awk -F/ '$0=$NF'`
export OUTPUTDIR=`echo "$INFILENAME" | sed 's/.zip//g'`
echo "OUTPUTDIR is"
echo "$OUTPUTDIR"
export STARTINGDIR="$PWD"
if [ -f "$1" ]
then
        echo "Found file."
        mkdir "$OUTPUTDIR"
        cd "$OUTPUTDIR"
        if [ `echo "$1" | grep [/]` ]
        then
                #echo "yeah, starts with a slash"
                unzip "$1"
        else
                #echo "no slash"
                unzip "$STARTINGDIR/$1"
        fi
#        unzip "$1"
else
        echo "$1 not found. Sorry."
fi