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     -f    Follow. If the input-file is not a pipe,  the  program
           will  not  terminate  after the line of the input-file
...
           read and copy further  records  from  the  input-file.
           Thus  it  may  be used to monitor the growth of a file
           that is being written by some other process.

use IO::Select;
open (F, 'tail -f somefile.log |') or die;
...
      print $lastrec;
   }
}