Use Term::ReadKey.
The ReadKey function allows yout to specify a timeout. example (untested): 
print "X done. Y starting in 15 seconds. Press any key to do Z instead
+.\n";
my $selection=ReadKey(15);
if ($selection)
{
     # Key pressed. Do Z.
}
else
{
    # No key pressed. Do Y.
}

[download]
Could easily be altered to use ReadKey(1) and print the prompt every second.

In reply to Re: CLI Interactivity - Timed Prompt by leighsharpe
in thread CLI Interactivity - Timed Prompt by viska

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