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A left parenthesis (the plural of parenthesis is parentheses) looks like this:
Left and right parentheses are used to clarify what you mean in certain arithmetic expressions, as well as telling where the members of a list and the arguments to a function or subroutine begin and end.
Tinkering with Perl is a free book that provides an introduction to programming in Perl, as well as a basic reference for things like foreach in Perl, if-then, and if-then-else, in addition to providing a glossary where you can find definitions for concatenate and other terms.
Tinkering with Perl may be one of the most popular offerings on this site, but it's not the only attraction. You can read a tongue-in-cheek Game Review: Meatspace, read an even more offbeat customer service survey (whether or not you actually fill it out), and spend a few minutes wishing your boss would read, The Administrator Who Cried, "Important!" (Not to mention that there are other things you can read here besides tech stuff, from Janra Ball: The Headache to The Spectacles.)
Jonathan's Corner
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Tinkering with Perl
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