Would you mind providing some explanatory sentences and establish a link to my recent problem?

Sure, see Re: A Beginner Needs Homework help and Re^3: A Beginner Needs Homework help

perlintro#Writing subroutines and http://learn.perl.org/books/beginning-perl/ Chapter 8: Subroutines

In reply to Re^5: search and replace strings in different files in a directory (Path::Tiny) by Anonymous Monk
in thread search and replace strings in different files in a directory by PitifulProgrammer

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