#!/bin/sh
if [ -n "$1" ]
then
  if [ -d "$1" ] 
  then
    cd "$1"
  else
    echo invalid directory
    exit
  fi
fi

for i in *
do
  OLDNAME="$i"
  NEWNAME=`echo "$i" | tr ' ' '_' | tr A-Z a-z | tr á a | tr č c | tr ď d | tr ě e | tr é e | tr í i | tr ň n | tr ó o | tr ř r | tr š s | tr ť t | tr ú u | tr ů u | tr ý y | tr ž z | sed s/_-_/-/g`
  if [ "$NEWNAME" != "$OLDNAME" ]
  then
    TMPNAME="$i"_TMP 
    echo ""
    mv -v -- "$OLDNAME" "$TMPNAME"
    mv -v -- "$TMPNAME" "$NEWNAME"
  fi
  if [ -d "$NEWNAME" ] 
  then
    echo Recursing lowercase for directory "$NEWNAME"
    $0 "$NEWNAME"
  fi
done