in reply to
I wouldn't name an input file "OUTPUTFILE", but that doesn't disturb perl.
The seek seeks from EOF, so negative offset is OK, if the file is longer than 500 bytes, so error checking would be better.
However, you are opening OUTPUTFILE and then seeking on CONFIRMEDOUTPUTFILE...
Use subroutines for code reuse
Master regular expressions
Write my GUIs with Perl
Abandon CGI in favor of some modern web framework
Put my code in modules
Create CPAN distributions
test and document my code as I write it
Write OOP with or without animal help
Finally switch to a modern Perl style
Create a killer application with Perl
Detoxify from Perl and PerlMonks
Choose another language because Perl is dead
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