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$ cat > Communicate.pm
package Communicate;
...
say_to('Nelo');

exit 0;

$ perl communicate.pl 
Well-done, Nelo!

$ perl -I. -e 'use Communicate greet => { greeting => q{Good job}, -as
+ => q{say_to} }; say_to(q{Nelo})'
Good job, Nelo!