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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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PERL_HASH_SEED_DEBUG

(Since Perl 5.8.1.) Set to one to display (to STDERR) the value of the hash seed at the beginning of execution. This, combined with is intended to aid in debugging nondeterministic behavior caused by hash randomization.

Note that the hash seed is sensitive information: by knowing it one can craft a denial-of-service attack against Perl code, even remotely, see 22.2.9 for more information. Do not disclose the hash seed to people who don't need to know it. See also hash_seed() of Hash::Util.

ISBN 9781906966027Perl Language Reference ManualSee the print edition