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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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The current value of the debugging flags. (Mnemonic: value of -D switch.) May be read or set. Like its command-line equivalent, you can use numeric or symbolic values, eg $^D = 10 or $^D = "st".

ISBN 9781906966027Perl Language Reference ManualSee the print edition