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  1. or download this
    # TEST.pm
package TEST;
...
sub test_sub {
  print "Hello, world!\n";
}
  2. or download this
    # TEST2.pm
package TEST2;
...
use TEST qw( test_sub );

1;
  3. or download this
    # Main script
use TEST2;
use TEST qw( test_sub );

test_sub();