This command is available with the Networking software installation option. Refer to [a manual with the abbreviation INSTALL] for information on how to install optional software.
ypwhich tells which Network Information Service (NIS) server supplies NIS services to an NIS client, or which is the master for a map. If invoked without arguments, it gives the NIS server for the local machine. If hostname is specified, that machine is queried to find out which NIS server it is using.
Refer to ypfiles.5 and ypserv.8 for an overview of the NIS services.
If neither version is specified, ypwhich attempts to locate the server that supplies the (current) v.2 services. If there is no v.2 server currently bound, ypwhich then attempts to locate the server supplying the v.1 services. Since NIS servers and NIS clients are both backward compatible, the user need seldom be concerned about which version is currently in use.
The Network Information Service (NIS) was formerly known as Sun Yellow Pages (YP). The functionality of the two remains the same; only the name has changed. The name Yellow Pages is a registered trademark in the United Kingdom of British Telecommunications plc, and may not be used without permission.
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