that ypxfr is supposed to log messages to /var/yp/ypxfr.log if it exists,
using syslog() makes more sense, especially since ypserv does the same
thing already. Try to use stderr by default, and use syslog() if stderr
is not a tty.
Also update the man page to reflect this change.
NIS maps (get rid of extraneous slash a la /var/yp//domainname).
Have ypxfr log all output to /var/yp/ypxfr.log if stdin is not a
tty. This should allow logging to be done when ypxfr is called from
inside ypserv in response to a yppush request.
Update man page to reflect the change (and fix a typo).