Read file names from stdin, verify that they are regular files. The nice thing about this is the in-place progress spinner

test-files-with-spinner

#!/bin/bash
spin='-\|/'
i=0
ceol=`tput el`

while read filename
do
  if [[ -f $filename ]]
  then
    i=$(( (i+1) % 4 ))
    printf "\r${spin:$i:1} ${filename}${ceol}"
  else
    printf"\n${filename}\n"
  fi
done

echo
exit 0