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Editorial Team
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Asked: 2026-06-18T16:05:15+00:00

Basically I’m looking for the perl equivalent of gdb’s "up" and "down" commands. If

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Basically I’m looking for the perl equivalent of gdb’s "up" and "down" commands. If I break on subroutine bar, and I have a call stack that looks like this:

foo
  \
   baz
    \
     bar

I’d like to be able to (without returning from bar or baz) navigate up the foo frame and see what it was doing by manipulating variables as I ordinarily would using arguments to p or x.

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1 Answer

  1. Editorial Team

    Use the y command.

    $ cat frames.pl
sub bar {
    my $fnord = 42;
    1
}
sub baz { bar }
sub foo {
    my $fnord = 23;
    baz
};
foo;
$ perl -d frames.pl

Loading DB routines from perl5db.pl version 1.37
Editor support available.

Enter h or 'h h' for help, or 'man perldebug' for more help.

main::(frames.pl:10):   foo;
DB<1> c 3
main::bar(frames.pl:3):     1
DB<2> y 2 fnord
$fnord = 23
DB<3> T
. = main::bar() called from file 'frames.pl' line 5
. = main::baz() called from file 'frames.pl' line 8
. = main::foo() called from file 'frames.pl' line 10
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