#!/bin/bash
cd Pomocni
valid="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-_./"
find . | while read f
 do
j=1
z=$f
        d=$(echo ${#f})
        while [ $j -lt $d ]; do
               c=$(echo ${f:j:1})
                k=`echo $valid | grep -i "$c"`
                if [ "$k" == "" ]; then
  z=`echo ${z//"$c"/"_"}`
                fi
                let j=j+1
      done
   mv "$f" "$z"
done

find . -type f | while read I; do N=$( echo -n $I | tr -c 'a-zA-Z0-9./' '_' ); if [ "$I" != "$N" ]; then echo "$I -> $N"; mv "$I" "$N"; fi done;

#!/bin/bash
find . -type f | while read I; do 
	N=$( echo -n $I | tr -c 'a-zA-Z0-9./' '_' );
	if [ "$I" != "$N" ]; then
		echo "$I -> $N";
		mv "$I" "$N";
	fi
done;

find . -type f | while read I; do

N=$( echo -n $I | tr -c 'a-zA-Z0-9./' '_' );

if [ "$I" != "$N" ]; then
	echo "$I -> $N";
	mv "$I" "$N";
fi

find . -type f | while read I; do N=$( echo -n $I | tr -cs 'a-zA-Z0-9./' '_' ); if [ "$I" != "$N" ]; then echo "$I -> $N"; mv "$I" "$N"; fi done;

#!/bin/bash
cd test
valid="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-_."
find . | while read f; do
j=1
        d=$(echo ${#f})
        while [ $j -lt $d ]; do
               c=$(echo ${f:j:1})
                k=`echo $valid | grep -i $c`
                if [ "$k" = "" ]; then
                        c="_"
                fi
                r=$r$c
                let j=j+1
      done
  r=$(echo ${r:1:d-2})
#if ["$f" -ne "$r"]; then
 mv "$f" "$r" 
#fi
r=""
done