domainname(1)domainname(1)NAMEdomainname - set or display name of Network Information Service domain
Network Information Service (NIS) uses domain names to refer collec‐
tively 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 con‐
figuration file by setting the variable. The name_of_domain is nor‐
mally a valid Internet domain name.
NIS servers use the NIS domain name as the name of a subdirectory of
Therefore, name_of_domain cannot be a or and it must not contain 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 ver‐
sion 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 this
was developed by Sun Microsystems, Inc.
SEE ALSOypinit(1M), getdomainname(2), setdomainname(2).