PROGRAM
	overstrike
USAGE
	overstrike
DESCRIPTION
	overstrike is a text stream filter, prepending to a sequence of	characters
	ASA carriage control codes (ANSI X3.78-1981(R1992). It assumes a line printer
	that interprets ASCII character codes (INCITS/ISO/IEC 646), especially where
	a line feed pushes the carriage down, and a carriage return pushes the
	carriage back to its left most position.

	test.txt provides backspace, tab, form feed, blank, and newline
	characters as a demonstration of the filter behavior.
EXAMPLE
	C:\Users\David\> overstrike <test.txt
	         x
	+        x
	 abc
	+___
	 abc
	+___
	        Here's some stuff.
	1FF
	 foo
	   @        @   @
BUGS
	overstrike is naive of double and triple spacing, and vertical
	tabs.

	It is inefficient in producing a new overstrike line for each
	sequence of backspaces.