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$PERLDB
$^P

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$PERLDB
$^P
The internal variable for debugging support. Different bits mean the following (subject to change):

  1. x01 Debug subroutine enter/exit.

  2. x02 Line-by-line debugging.

  3. x04 Switch off optimizations.

  4. x08 Preserve more data for future interactive inspections.

  5. x10 Keep info about source lines on which a subroutine is defined.

  6. x20 Start with single-step on.

Note that some bits may be relevent at compile-time only, some at run-time only. This is a new mechanism and the details may change.

Source: Perl predefined variables
Copyright: Larry Wall, et al.
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