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What is ypxfr, ypxfrd, yppush and yppoll command ?

What is ypxfr, ypxfrd, yppush and yppoll command? all looks to transferring map from a NIS server to the NIS client/slave. Could someone let me know the under which circumstances we use these command? Thanks!
2 Solutions
please use man page to learn the usage of the commands, eg, type in
man ypxfr
man  ypxfrd
The following doc also has information and example of the commands.
Please have a look at :
Solaris NIS FAQ:
Brian UtterbackPrinciple Software EngineerCommented:
In practice, the only one you should generally use is yppush, when you update a map on the master and you want to
push it out quickly. You might use yppoll if you find that a slave is out of date for some reason. The ypxfr and ypxfd are
used internally. You should only be using those if you want to get a map outside of the clients domain, or before it is
a client or server.
beer9Author Commented:
Thank you :-)

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