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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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${^OPEN}

An internal variable used by PerlIO. A string in two parts, separated by a \0 byte, the first part describes the input layers, the second part describes the output layers.

ISBN 9781906966027Perl Language Reference ManualSee the print edition