DSM-G600, DNS-3xx and NSA-220 Hack Forum

I'll need help removing illegal character from filename.

I'm downloading files from a digital receiver (Topfield) thrue a wireless connection.
the filename has control characters and other illegal signs.



killall lftp
lftp -c 'open -e "mget -c -E -O  /mnt/HD_a2/AV-Media/Topfield/tmp *.rec" 192.168.0.2:/DataFiles/Xfer'

for file in /mnt/HD_a2/AV-Media/Topfield/tmp/*.rec
do
   Path=${file%/*}
   Path=${Path%/*}
   tmpFilename=${file##*/}
   schar=`expr "$tmpFilename" : '\(.\)'`
   tmpFilename=${tmpFilename#$schar}
   Filename=""
   
   while [ "$schar" != "" ]
   do
    #tmptest=`expr "$schar" : '\([[:alnum:][:blank:]._-]\)'`
    #if [ "$tmptest" != "" ]
    if [ "`expr "$schar" : '\([[:alnum:][:blank:]._-]\)'`" != "" ]
    then
       Filename="$Filename$schar"
    else
       Filename="$Filename""_"
    fi       
    
    schar=`expr "$tmpFilename" : '\(.\)'`
    tmpFilename=${tmpFilename#$schar}
  done
  Filename="$Path/$Filename"
  mv "$file" "$Filename"
  chmod a+rw -v "$Filename"
  echo $Filename
done