#!/usr/bin/ksh

typeset oldfile=""
typeset newfile=""

# the grep filters for filenames with spaces only:
ls -1 | grep "[^ ] [^ ]" | while read oldfile ; do
     newfile="$( print - $oldfile | tr -d ' ')"
          print - "mv \"${oldfile}\" \"${newfile}\"" # just display, next line is working
               mv "$oldfile" "$newfile"
               done