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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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Current state of the interpreter.

$^S State
undef Parsing module/eval
true (1) Executing an eval
false (0) Otherwise

The first state may happen in $SIG{__DIE__} and $SIG{__WARN__} handlers.

ISBN 9781906966027Perl Language Reference ManualSee the print edition