cd $1
for f in *; 
do 
case $f in (*.pdf)  echo "nedelam nic $f";;
(*.ps)  echo "nedelam nic $f";;
(*) if head -1 $f | grep "^%PDF" >/dev/null; then mv $f $f.pdf;
else echo "nedelam nic $f"; fi;;
esac;
done


#if head -1 $f | grep "^%PDF" ; then mv $f $f.ps; fi
#if ls; then echo "ano"; fi