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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 warning switch, initially true if -w was used, false otherwise, but directly modifiable. (Mnemonic: related to the -w switch.) See also "Perl pragma to control optional warnings" (warnings) in the Perl Library Reference Manual (Volume 1).

ISBN 9781906966027Perl Language Reference ManualSee the print edition