when -s is specified with no argument. Option arguments in pr (as documented)
need to immediately follow the option. For example to set the separator char
to `.' you need to use "pr -s." instread of "pr -s .". The second form sets
the separator character to tab, and reads from file `.'. Coredumping is wrong
anyway, so fix that. Grr to POSIX for not forcing pr and a few other utilities
to use getopt(3).
cvs: ----------------------------------------------------------------------
environment variable; since there isn't a standard format provided by the
C library that corresponds to pr's default header format, add a new option
'-T' to take a strftime() format string if desired.
lukem