fpr is a filter that transforms files formatted
  according to Fortran's carriage control conventions into files formatted
  according to UNIX line printer conventions.
fpr copies its input onto its output,
    replacing the carriage control characters with characters that will produce
    the intended effects when printed using
    lpr(1). The first character of
    each line determines the vertical spacing as follows:
  
    | Blank | One line | 
  
    | 0 | Two lines | 
  
    | 1 | To first line of next page | 
  
    | + | No advance | 
 
A blank line is treated as if its first character is a blank. A
    blank that appears as a carriage control character is deleted. A zero is
    changed to a newline. A one is changed to a form feed. The effects of a
    ‘+’ are simulated using backspaces.
a.out | fpr | lpr
fpr < f77.output |
  lpr
The fpr command appeared in
  4.2BSD.
Results are undefined for input lines longer than 170 characters.