Here is an example of the code i am using in the start.pl

#!/usr/bin/perl

use strict;
use warnings;
use Time::HiRes qw(usleep);


require moduleA;
require moduleB;

 
&moduleA::functionA();

&moduleB::functionA();

&moduleB::functionB();

__END__
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and the perl moduleA

package moduleA;

use strict;
use warnings;

require Expect;
require Time::HiRes;
require moduleB;
use Time::HiRes qw(usleep);




sub functionA() {
    my variableA ="&moduleB::functionB";
..............
................
return someihng; 
}
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When using pp