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
$ 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.
mg_backspace [, nchars]
- nchars in optional type=long default=1L
number of characters to backspace
Try the main-level example program at the end of this file:
IDL> .run mg_backspace