knowing progress while reading a file

Hi,
I am parsing a very big file say 10 MB. It 'll take more than an hour ..I want to know the progress say in % .Is there any way to do that???
or
(Is there any way to know which line of the file I am in [ no modification in the source file] )

Depends on what's parsing it.

You may want to view this link for progress bar script and related topics.