Please check this module File::Tail

File::Tail - Perl extension for reading from continuously updated files

I have checked that module. But actually my job is not only file parsing after every interval, the operation could change later.

I need a timer basically, so as to carry out any operation (for example file parsing, running some function) after an interval automatically. .

I have checked that module.

You could have told that in your first post:). No Problem.

read perl alarm.alarm and also check this module Sys::AlarmCall

One of many approaches would be to do it like this:

my $interval = 60      * 5
#              seconds * minutes

my $run_when = time + $interval;

while (1) {
    # ...
    if (time - $run_when <= 0) {
        do_the_stuff;
        $run_when = time + $interval; 
    }
}
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Does the file ever get rolled (renamed to $file.bak and a new $file created - .bak is just an example, could be numbered or dated backups as well)? If so, you will have to deal with the logic of parsing the remains of the old file and then starting at the beginning of the new file as well.