ypxfr(1M)                                                         ypxfr(1M)


   NAME
         ypxfr - transfer YP map from a YP server to host

   SYNOPSIS
         /usr/sbin/ypxfr [ -c ] [ -f ] [ -d ypdomain ] [ -h host ] [ -s
         ypdomain ] [ -C tid prog server ] mapname

   DESCRIPTION
         The ypxfr command moves a YP map in the default domain for the local
         host to the local host by making use of normal YP services.  It
         creates a temporary map in the directory /var/yp/ypdomain (this
         directory must already exist; ypdomain is the default domain for the
         local host), fills it by enumerating the map's entries, fetches the
         map parameters (master and order number), and loads them.  It then
         deletes any old versions of the map and moves the temporary map to
         the real mapname.

         If run interactively, ypxfr writes its output to the terminal.
         However, if it is started without a controlling terminal, and if the
         log file /var/yp/ypxfr.log exists, it appends all its output to that
         file. Since ypxfr is most often run from the privileged user's
         crontab file, or by ypserv, the log file can be used to retain a
         record of what was attempted, and what the results were.

         For consistency between servers, ypxfr should be run periodically for
         every map in the YP data base.  Different maps change at different
         rates: a map may not change for months at a time, for instance, and
         may therefore be checked only once a day.  Some maps may change
         several times per day.  In such a case, you may want to check hourly
         for updates.  A crontab(1) entry can be used to perform periodic
         updates automatically.  Rather than having a separate crontab entry
         for each map, you can group comands to update several maps in a shell
         script.  Examples (mnemonically named) are in /usr/sbin/yp:
         ypxfr1perday, and ypxfr1perhour.  They can serve as reasonable
         first cuts.

         Refer to ypfiles(4) and ypserv(1M) for an overview of the YP name
         service.

         The following options are available:

         -c    Do not send a Clear current map request to the local ypserv
               process. Use this flag if ypserv is not running locally at the
               time you are running ypxfr.  Otherwise, ypxfr complains that it
               cannot talk to the local ypserv, and the transfer fails.

         -f    Force the transfer to occur even if the version at the master
               is not more recent than the local version.





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   ypxfr(1M)                                                         ypxfr(1M)


         -C tid prog server
               This option is only for use by ypserv.  When ypserv starts
               ypxfr, it specifies that ypxfr should call back a yppush
               process at the host server, registered as program number prog,
               and waiting for a response to transaction tid.

         -d ypdomain
               Specify a domain other than the default domain.

         -h host
               Get the map from host, regardless of what the map says the
               master is. If host is not specified, ypxfr asks the YP service
               for the name of the master, and try to get the map from there.
               host must be a name.

         -s ypdomain
               Specify a source domain from which to transfer a map that
               should be the same across domains.

   FILES
         /var/yp/ypxfr.log             log file
         /usr/sbin/yp/ypxfr1perday    script to run one transfer per day, for
                                       use with cron(1M)
         /usr/sbin/yp/ypxfr1perhour   script for hourly transfers of volatile
                                       maps
         /var/yp/ypdomain              YP domain
         /usr/spool/cron/crontabs/root privileged user's crontab file

   SEE ALSO
         cron(1M), crontab(1), ypserv(1M), yppush(1M), ypfiles(4)























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