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#!/usr/bin/perl -w
use strict;
...
        print("*\n");
        sleep 1;
}

param: 4
Command line reporter
...
*
*
*

exec '/usr/bin/perl', '-T', 'child.pl', 'number=10' or
 die "Cannot execute : $!";

Use of uninitialized value in concatenation (.) or string at child.pl 
+line 10.
param: 
...
parameters which was
1: number=10
Use of uninitialized value in numeric lt (<) at child.pl line 17.