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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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Command-line options (switches). Switches in this variable are taken as if they were on every Perl command line. Only the -[CDIMUdmtwW] switches are allowed. When running taint checks (because the program was running setuid or setgid, or the -T switch was used), this variable is ignored. If PERL5OPT begins with -T, tainting will be enabled, and any subsequent options ignored.

ISBN 9781906966027Perl Language Reference ManualSee the print edition