:bt

Arguments:

The :bt command provides a quick way to scan the stack (contrast with :zoom). :bt has no abbreviation.

Here is the effect of the :bt command on the error when an attempt is made to evaluate foo which has no value. When the error occured, :zoom is printing all frames (:all t) so :bt does as well.

USER(23): foo
Error: Attempt to take the value of the unbound variable `FOO'.
[condition type: UNBOUND-VARIABLE]

[1] USER(24): :bt
Evaluation stack:

  EVAL <-
  TPL::READ-EVAL-PRINT-ONE-COMMAND <- 
  EXCL::READ-EVAL-PRINT-LOOP <-
  TPL::TOP-LEVEL-READ-EVAL-PRINT-LOOP1 <-
  TPL:TOP-LEVEL-READ-EVAL-PRINT-LOOP <- APPLY <-
  TPL:START-INTERACTIVE-TOP-LEVEL <- TPL::START-TOP-LEVEL <-
  EXCL::START-REBORN-LISP

See top-level.htm for more information on top-level commands.

Copyright (c) 1998-2022, Franz Inc. Lafayette, CA., USA. All rights reserved.
This page was not revised from the 10.0 page.
Created 2019.8.20.