cd /var/yp ; ./ypbuild SHELL=/sbin/sh [map]
With no arguments, make (or ypbuild) creates dbm databases for any NIS maps that are out-of-date, and then executes yppush(1Mnis) to notify slave databases that there has been a change.
If map is supplied on the command line, make (or ypbuild) will update that map only.
There are three special variables used by make (or ypbuild) in the Makefile: DIR, which gives the directory of the source files; NOPUSH, which when non-null inhibits doing a yppush of the new database files; and DOM, used to construct a domain other than the master's default domain. The default for DIR is /etc, and the default for NOPUSH is the null string.
make (or ypbuild) also creates entries in /var/yp/aliases. These entries are generated by /usr/sbin/ypalias, which takes a string as input and returns the alias derived from that string.
Refer to ypfiles(4nis) and ypserv(1Mnis) for an overview of the NIS service.