If it's just a matter of forgetting the syntax, there is

• http://michaelgoerz.net/refcards/perl_refcard.pdf or http://cheat-sheets.org/saved-copy/perl_refcard.pdf (2 pages)
• http://www.cheatography.com/mishin/cheat-sheets/perl-reference-card/ (the same "original", but 6 pages)

But, of course, this doesn't replace a good introductory text/book

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