# ListLines

Displays the script lines most recently executed.

ListLines [, On|Off]

#### Parameters

On|Off | If blank or omitted, the history of lines most recently executed is shown. In v1.0.48.01+, an optional first parameter was added, which can be either On or Off. It affects only the behavior of the current thread as follows: On: Includes subsequently-executed lines in the history. This is the starting default for all scripts. Off: Omits subsequently-executed lines from the history.

#### Remarks

ListLines (with no parameter) is equivalent to selecting the "View->Lines most recently executed" menu item in the main window. It can help debug a script.

"ListLines Off/On" can be used to selectively omit some lines from the history, which can help prevent the history from filling up too quickly (such as in a loop with many fast iterations). "ListLines Off" may also improve performance by a few percent.

Every newly launched thread (such as a hotkey, custom menu item, or timed subroutine) starts off fresh with the default setting for this command. That default may be changed by using this command in the auto-execute section (top part of the script).

Although there is no built-in variable "A_ListLines", similar functionality can be achieved by including the following in a script:

    ListLines(PassTrueToTurnOnOrFalseToTurnOff)  ; Returns the previous setting of ListLines (prior to this call).
    {
        static sListLines := true  ; The starting default for all scripts is "ListLines On".
        ListLines % PassTrueToTurnOnOrFalseToTurnOff ? "On" : "Off"  ; Execute ListLines unconditionally to omit the lines executed below from the log.
        ListLines_prev := sListLines
        sListLines := PassTrueToTurnOnOrFalseToTurnOff
        return ListLines_prev
    }

    ; To use the above function:
    prev_ListLines := ListLines(false)  ; Turn off ListLines temporarily.
    ; ...
    ListLines(prev_ListLines)  ; Restore ListLines to its previous setting.

On a related note, the built-in variables A_LineNumber and A_LineFile contain the currently executing line number and the file name to which it belongs.

#### Related

KeyHistory, ListHotkeys, ListVars

#### Example

    ListLines
    ListLines Off