Figure 48–15. $treatLikeNul
The PROCEDURE $treatLikeNul is TRUE of character codes that, like NUL and (on some systems) carriage return, are discarded on input from files where keepNul is not set.
On platforms where eol is linefeed, $treatLikeNul is TRUE of NUL and carriage return; on platforms where eol is carriage return, $treatLikeNul is TRUE only of NUL. See Section 39.1.1 for a more complete discussion of the treatment of carriage returns in text files.