({{, (RefLink[CellEvaluationDuplicate, paclet:ref/CellEvaluationDuplicate])
is an option for (RefLink[Cell, paclet:ref/Cell]) which specifies whether the front end should make a copy of the cell before performing any evaluation of its contents that you request. }})

OpenersNotesSection(Spacer1)Details

New cells generated when (RefLink[CellEvaluationDuplicate, paclet:ref/CellEvaluationDuplicate])->(RefLink[True, paclet:ref/True]) have styles specified by the setting for (RefLink[DefaultDuplicateCellStyle, paclet:ref/DefaultDuplicateCellStyle]) for the notebook.

(RefLink[CellEvaluationDuplicate, paclet:ref/CellEvaluationDuplicate]) is typically set for styles of cells rather than for individual cells.

OpenersPrimaryExamplesSection(Spacer1)Examples  (1)

OpenersExampleSection0(Spacer1)Basic Examples  (1)

Create an input cell with (RefLink[CellEvaluationDuplicate, paclet:ref/CellEvaluationDuplicate]) set to (RefLink[True, paclet:ref/True]):

CellPrint[ExpressionCell[Defer[list=Join[{a,b},{c,d}]],"Input",CellEvaluationDuplicate->True]]

list=Join[{a,b},{c,d}]

Select (RefLink[Join, paclet:ref/Join])[{a,b},{c,d}] and use Evaluation ▶ Evaluate in Place to create a new cell:

list={a,b,c,d}

({{DocumentationFooterIconsRelatedFunction.png, ({{See Also}, {(RefLink[CellEditDuplicate, paclet:ref/CellEditDuplicate])  ▪  (RefLink[Evaluatable, paclet:ref/Evaluatable])  ▪  (RefLink[CellAutoOverwrite, paclet:ref/CellAutoOverwrite])}})}})

({{DocumentationFooterIconsRelatedTutorial.png, ({{Tutorials}, {▪(RefLinkPlain[Options for Cells, paclet:tutorial/OptionsForCells])}})}})

({{DocumentationFooterIconsRelatedGuide.png, ({{Related Guides}, {▪(RefLinkPlain[Evaluation Options in Notebooks, paclet:guide/EvaluationOptionsInNotebooks])}})}})