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-s, --sleep-interval=S
  with -f, sleep for approximately S seconds (default 1.0) between ite
+rations

# generate test log file in bash
$ while true ; do echo $(( ++i )) ; sleep .1 ; done > test

# little File::Tail demo
use Time::HiRes qw( gettimeofday );
...
  ( $sec_since_epoch, $usec ) = gettimeofday();
  printf "%d.%d\n", $sec_since_epoch, $usec;
}