Perl Debugged

A.4. Environment Variables

The following environment variables affect the operation of the debugger:

PERL5DB

This contains the code that starts the debugger; if absent, it defaults to BEGIN

{ require 'perl5db.pl' }.

PERLDB_OPTS

This variable can contain initialization commands using options, which may, for instance, cause the debugger to run noninteractively and dump tracing information to a file. See the perldebug POD page for much more information.

PERLDB_RESTART

If this variable is defined, the debugger will then look for environment variables whose names begin with any of the following:

 PERLDB_VISITED PERLDB_HIST PERLDB_ON_LOAD PERLDB_POSTPONE PERLDB_INC PERLDB_FILE PERLDB_OPT PRELDB_PRETYPE PERLDB_PRE PERLDB_POST PERLDB_TYPEAHEAD ...