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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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Undefined subroutine in sort

(F) The sort comparison routine specified is declared but doesn't seem to have been defined yet. See .

ISBN 9781906966027Perl Language Reference ManualSee the print edition