in reply to Write a Loop
Loops: See Compound Statements.
Finding keywords: See perlreref.
'Extracting': See print or Additive Operators depending on what you mean by extracting.
You will likely need to declare some variables with my and use Auto increment and Auto decrement to count the number of lines you've extracted.
Exiting: See Loop Control.
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In Section
Seekers of Perl Wisdom