so I should write: 
use strict;
use warnings;
use diagnostics;

use Time::HiRes qw( time );
my $start = time();

system("program-name file-name");

my $end = time();
my $runtime = sprintf("%.16s", $end - $start);
print "This script took $runtime seconds to execute\n";

[download]
isn't it?

In reply to Re^2: timing a command execution with perl by Anonymous Monk
in thread timing a command execution with perl by savio

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