Here is a time-based version using perldoc -f sleep 
use warnings;
use strict;

my @cmd = 1 .. 200;
my $i = 0;
for (@cmd) {
    print "$_\n";
    $i++;
    sleep 2 if $i % 20 == 0;
}

[download]

See also:

In reply to Re: pause output when printing an array to the screen by toolic
in thread pause output when printing an array to the screen by dubl1n

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