Append extension

#!/bin/bash

for fisier in *; do
    type=`file $fisier`;
    image=`grep "image" <<< $type &>/dev/null;echo $?`;

    if [[ "$image" -eq "0" ]] ;then
        ext=`echo $type| tr -s ' ' | cut -d " " -f 2 | tr [:upper:] [:lower:]`;
        echo $ext;
        cp "$fisier" "$fisier.$ext";
    fi;
done;