#!/bin/sh

UNTAR="tar -xvf "

#unzip all zip files

function unzip_all_file()

{

    for i in *.zip

    do

        unzip $i

    done

}

#untar all tar.gz files

function untar_all_file()

{

    for i in *.tar.gz

    do

        $UNTAR $i

    done

}

case $ in

    unzip)

        unzip_all_file

        ;;

    untar)

        untar_all_file

        ;;

esac