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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
RRP £29.95 ($39.95)

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Unknown warnings category '%s'

(F) An error issued by the warnings pragma. You specified a warnings category that is unknown to perl at this point.

Note that if you want to enable a warnings category registered by a module (e.g. use warnings 'File::Find'), you must have imported this module

ISBN 9781906966027Perl Language Reference ManualSee the print edition