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Re: What generates the In/Out CellLabels and how do I change them?

I'm not aware of options for arbitrary customization, but two things I can 

* The display can be turned off using the ShowCellLabel option, which you could 
apply to, e.g., the Input/Output styles.
* The style of the label itself is determined by the style CellLabel, found in 


John Fultz
jfultz at
User Interface Group
Wolfram Research, Inc.

On Fri, 15 Oct 2010 13:53:07 -0400 (EDT), Simon wrote:
> When Mathematica evaluates a cell, it gives the Input cell and Output
> cell the CellLabels In[$Line]:= and Out[$Line]= where $Line is a
> counter that gets incremented on each evaluated input.
> If you input something like TraditionalForm[expr] or TeXForm[expr] (or
> any other *Form from $OutputForms) then the name of the form also gets
> added to the Output cell's label. eg Out[1]//TraditionalForm=.
> I can't find any way of customising these labels.
> * They can be disabled in the Preferences dialog.
> * They don't seem to be in the StyleSheet options for Input and
> Output cells - although the options pertaining to the CellLabel
> behaviour are there.
> * Nor in the Notebook options - although Notebook Options >
> Evaluation Options > EvaluationCompletionAction can modify the
> CellLabels.
> * Nor any of the init.m type configuration files.
> So, does anyone know where these CellLabels are generated?
> (Note: This question was also asked at
> I have a feeling that this has been discussed here before - but I
> could not find the thread)

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