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I'm not sure I know what you mean, but you can select an area with the various selection tools, then erase the selected area by pressing the Delete key or by using Edit>Erase Selection. I don't think you can change the shape of the area the Eraser erases; it's always circular.

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Using another tool may or may not help with what you want, but, as an alternative idea, the line/curve tool has square endcap options and I think pencil tool draws square. You can erase with them by setting their blending modes to overwrite and changing your primary or secondary color to Opacity - Alpha 0.

 

-- Choose the tool you want.

-- Change the blending mode.

-- Lower the Opacity - Alpha Slider in the colors window.

 

Overwrite_OpacityAlpha0_zps1d72d2b2.jpg

 

Here is an example picture showing different ways to erase and delete things.

OverwriteAlpha0AndSelectDeleteSized_zps9

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