Shell Programming and Scripting

I agree...

Yupp that is true...

thanks guys....didn't expect would get solution within minutes!!!

Just to clarify that the ASCIIbetical order is part of the shell expansion (*.afp, in this case) and not the -1 (one file per line) option.
Note also that -1 option is active only in interactive usage (ls -1 | ... doesn't make sense because it's equivalent to ls | ...).

I would write something like this [1]:

Code:

printf '%s\n' LTR.PDF* |
  sort -t. -k2.4n |
    while IFS= read -r; do
      <process "$REPLY" here ...>
    done

[1] Older shells won't accept read with no argument(s) (and some don't provide the -r option), so you may need to use:

Code:

while IFS= read fname; do
  <process "$fname" here ...>
done