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### 38.2 Keyword Commands

Keyword commands are special keywords which are not interpreted as Maxima expressions. A keyword command can be entered at the Maxima prompt or the debugger prompt, although not at the break prompt. Keyword commands start with a colon, ’`:`’. For example, to evaluate a Lisp form you may type `:lisp` followed by the form to be evaluated.

    (%i1) :lisp (+ 2 3)
    5

The number of arguments taken depends on the particular command. Also, you need not type the whole command, just enough to be unique among the break keywords. Thus `:br` would suffice for `:break`.

The keyword commands are listed below.

`:break F n`

  Set a breakpoint in function `F` at line offset `n` from the beginning of the function. If `F` is given as a string, then it is assumed to be a file, and `n` is the offset from the beginning of the file. The offset is optional. If not given, it is assumed to be zero (first line of the function or file).

`:bt`

  Print a backtrace of the stack frames

`:continue`

  Continue the computation

`:delete`

  Delete the specified breakpoints, or all if none are specified

`:disable`

  Disable the specified breakpoints, or all if none are specified

`:enable`

  Enable the specified breakpoints, or all if none are specified

`:frame n`

  Print stack frame `n`, or the current frame if none is specified

`:help`

  Print help on a debugger command, or all commands if none is specified

`:info`

  Print information about item

`:lisp some-form`

  Evaluate `some-form` as a Lisp form

`:lisp-quiet some-form`

  Evaluate Lisp form `some-form` without any output

`:next`

  Like `:step`, except `:next` steps over function calls

`:quit`

  Quit the current debugger level without completing the computation

`:resume`

  Continue the computation

`:step`

  Continue the computation until it reaches a new source line

`:top`

  Return to the Maxima prompt (from any debugger level) without completing the computation

Note: Keyword commands must (currently) start at the beginning of a line. Not even a single space character is allowed before the colon.

Categories: Debugging ·

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