domainname - set or display name of Network Information Service domain
Network Information Service (NIS) uses domain names to refer
collectively to a group of hosts. Without an argument, domainname
displays the name of the NIS domain. Only superuser can set the
domain name by providing name_of_domain. The domain name is usually
set in the configuration file /etc/rc.config.d/namesvrs, by setting
the NIS_DOMAIN variable.
NIS servers use the NIS domain name as the name of a subdirectory of
/var/yp. Since the NIS domain name can be as long as 64 characters,
name_of_domain may exceed the maximum file name length allowed on a
given file system. If that length is exceeded, the subdirectory name
becomes a truncated version of the NIS domain name.
The first 14 characters of all NIS domains on the network must be
unique: truncated names should be checked to verify that they meet
domainname was developed by Sun Microsystems, Inc.
ypinit(1M), getdomainname(2), setdomainname(2).
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000