how to undo changes in nano editor code example

Example 1: how to undo in nano editor

Starting with nano version 2.3.5 in July 2014, undo/redo became standard:

Alt-U or Option-U or EscU - undo
Alt-E or Option-E or EscE - redo

Example 2: how to undo in nano

Starting with nano version 2.3.5 in July 2014, undo/redo became standard:

Alt-U or Option-U or EscU - undo
Alt-E or Option-E or EscE - redo