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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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-U

allows Perl to do unsafe operations. Currently the only "unsafe" operations are attempting to unlink directories while running as superuser, and running setuid programs with fatal taint checks turned into warnings. Note that the -w switch (or the $^W variable) must be used along with this option to actually generate the taint-check warnings.

ISBN 9781906966027Perl Language Reference ManualSee the print edition