Backspaces a nchars characters. Backspacing beyond the beginning of a line will have no effect.

If trying to erase previous content, make sure to print the previous content using the $ format code which indicates to not move to a new line.

Note that this routine will not work in terminals that don't understand ANSI escape codes, i.e., the Workbench command line.

Try the main-level example program at the end of this file: