Neil wrote:
>  
>  Basically, I want to open a file, read the contents, and munge the data and
>  write it out to a second file.
>  
>  BUT ... if the original data file changes - I'd like to reparse/remung
>  before writing.
>  
>  Unfortunately, last mod time does not work IF the data was changed twice in
>  the last second.
>  
>  Size doesn't work because a byte chould be changed with no change in
>  size..and twice in the last second.
>  
>  I was hoping that there could be some kind of checksum solution.

You could checksum the file after slurping it using unpack or Digest::MD5

You could then later on check the file again and see if the checksum is
different.  Probably not necessary though - the mtime is probably sufficient
if the content changes that often.  You could also check into serial use
of the file as a solution (some sort of locking if you can modify the
other writer).

-- 
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