In the field of electronic technology, "su" usually refers to a command line tool in Unix and Unix-like operating systems. In this case, it is not possible to directly convert rounded corners into right angles. However, if you are using graphics editing software or design software to change the rounded corners of the object into right angles, you can use the following methods:

1. Adobe Photoshop: Select the "Rounded Rectangle Tool" (Rounded Rectangle Tool)", click the Shape option on the toolbar, set "Corners" to 0, and then draw a right rectangle.

2. Adobe Illustrator: Select the "Rounded Rectangle Tool", click once to open the Rounded Rectangle option box, set "Rounded Corners" to 0, and draw a right rectangle.

3. GIMP (free software): In image editing mode, use the "Rectangle Select Tool" to select the rounded rectangle, then right-click the selected area and select the "Rectangle Tool" (Rounded Rectangle Tool)" and set "Roundness" to 0 to turn rounded corners into right angles.

Please note that the above method is suitable for modifying the rounded corners of graphic objects, not turning rounded objects in the real world into right angles.

Hope this helps!