This is documentation for Mathematica 5, which was
based on an earlier version of the Wolfram Language.
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Documentation / Mathematica / Front End / Menu Commands / Edit Menu /

Select All

FilledSmallSquare Select All selects all cells in the current notebook.

FilledSmallSquare Keyboard shortcuts: ControlKeyLeftModifieda RightModified(Windows); CommandKeyLeftModifieda RightModified(Macintosh); ControlKeyLeftModifieda RightModified (X).