permutation

#!/biin/bash

permutal() {
in="$1"
out="$2"
  if [ -z "$elemek" ]
  then
    echo "$out"
    return
  fi

  for (( i=0; i < ${#elemek}; i++ ))
  do
    ( permutal "${elemek:0:i}${elemek:i+1}" "$out${elemek:i:1}" )
  done
}

permutal `cat $1` > $2